Transcript Document

UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 1
Work
†After
Attendance
(†EQ Sheet; Concept Map)
• Place HW on my desk
• †Pickup a new Essential Question Sheet and a
Conservation of Energy Concept Map
• Pickup and sign out your computer
• Log into www.plutonium-239.com
• Select the Warm-Up link
• Complete today’s warm-up and submit it
• Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• Causes of Force Test
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Chapter 6
Work and Energy
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Units of Chapter 6
•Work Done by a Constant Force
•Work Done by a Varying Force
•Kinetic Energy and the Work-Energy Principle
•Potential Energy
•Conservative and Nonconservative Forces
•Mechanical Energy and Its Conservation
•Problem Solving Using Conservation of
Mechanical Energy
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Units of Chapter 6
•Other Forms of Energy; Energy
Transformations and the Law of Conservation of
Energy
•Energy Conservation with Dissipative Forces:
Solving Problems
•Power
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Equations to Know:
Conservation of Energy
W  Fr cos
F  kx
W
Pavg 
t
P  F cos
1 2
K  mv
2
U g  mgh
1 2
U s  kx
2
Conservation of Energy: Work
EQ(s): How do we calculate work in terms of kinetic
energy?
Start: I tell my wife,
“It is called work for
a reason, that is why
they pay you.” So,
what is work
afterall?
How do we calculate work in terms of kinetic energy?
6-1 Work Done by a Constant Force
The work done by a constant force is defined as
the distance moved multiplied by the component
of the force in the direction of displacement:
(6-1)
How do we calculate work in terms of kinetic energy?
6-1 Work Done by a Constant Force
In the SI system, the units of work are joules:
As long as this person does
not lift or lower the bag of
groceries, he is doing no work
on it. The force he exerts has
no component in the direction
of motion.
How do we calculate work in terms of kinetic energy?
6-1 Work Done by a Constant Force
Solving work problems:
1. Draw a free-body diagram.
2. Choose a coordinate system.
3. Apply Newton’s laws to determine any
unknown forces.
4. Find the work done by a specific force.
5. To find the net work, either find the net force
and then find the work it does, or find the
work done by each force and add.
How do we calculate work in terms of kinetic energy?
6-1 Work Done by a Constant Force
Work done by forces that oppose the direction
of motion, such as friction, will be negative,
because cos 180° = -1.
Centripetal forces do no
work, as they are always
perpendicular to the
direction of motion.
How do we calculate work in terms of kinetic energy?
6-2 Work Done by a Varying Force
For a force that varies, the work can be
approximated by dividing the distance up into
small pieces, finding the work done during
each, and adding them up. As the pieces
become very narrow, the work done is the area
under the force vs. distance curve.
How do we calculate work in terms of kinetic energy?
Pasco Work and Energy LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
How do we calculate work in terms of kinetic energy?
WebAssign/Lab Time
• Work on WebAssign Problems 6.1 - 6.4 or the Pasco Work and
Energy Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
How do we calculate work in terms of kinetic energy?
Summary
• Answer the Essential Question.
• Ticket out the Door:
– What is the formula for work?
– How much work have you done if you
strain to move a couch but never move it?
– How much work have you done if you lift
the couch 1 m up with a force of 500 N?
• HW:
– Pasco Work and Energy Lab (Questions
and Conclusions)
– WebAssign Problems 6.1 - 6.4
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 2
Kinetic Energy
Work-Energy Principle
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
Conservation of Energy:
Kinetic Energy
EQ(s): How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of
its kinetic energy?
Start: Solve the
following equation
for ax:
v2  v02  2ax
What have you calculated
if you multiply ax by its
mass?
INSERT
Picture
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
6-3 Kinetic Energy and the Work-Energy
Principle
Energy was traditionally defined as the ability to
do work. We now know that not all forces are
able to do work; however, we are dealing in these
chapters with mechanical energy, which does
follow this definition.
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
6-3 Kinetic Energy and the Work-Energy
Principle
If we write the acceleration in terms of the
velocity and the distance, we find that the
work done here is
(6-2)
We define the kinetic energy:
(6-3)
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
6-3 Kinetic Energy and the Work-Energy
Principle
If the KE of an object is doubled, by what factor
has its speed increased?
1 2
KE1  mv1 ;KE 2  2KE1
2
1
12 2 2
2
mvv
m v2  22v2v
m
2v
1 11 1
2
2
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
6-3 Kinetic Energy and the Work-Energy
Principle
If its speed is doubled, by what factor does its KE
increase?
1 2
KE1  mv1 ;v2  2v1
2
1
1  1 22 2
22
KE
mv
 KE
m
v222  44m
2v
4v

1
111

2
2 2
 
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
6-3 Kinetic Energy and the Work-Energy
Principle
This means that the work done is equal to the
change in the kinetic energy:
(The Work-Energy Principle)
(6-4)
• If the net work is positive, the kinetic energy
increases.
• If the net work is negative, the kinetic energy
decreases.
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
6-3 Kinetic Energy and the Work-Energy
Principle
Because work and kinetic energy can be
equated, they must have the same units:
kinetic energy is measured in joules.
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
Pasco Work and Energy LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
WebAssign/Lab Time
• Work on WebAssign Problems 6.1 - 6.7 or the Pasco Work and
Energy Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
How do we calculate work in terms of kinetic energy?
How can the velocity of an object be quantified in terms of its kinetic energy?
Summary
• Answer the Essential Questions.
• Ticket out the Door:
– What is the formula for kinetic energy?
– What is the formula for the work-energy
principle?
– What happens to the velocity of an
object if the net work is negative?
• HW:
– Pasco Work and Energy Lab (Questions
and Conclusions)
– WebAssign Problems 6.1 - 6.7
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 3
Potential Energy
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
Conservation of Energy:
Potential Energy
EQ(s): How can the position of an object be
quantified in terms of its potential energy?
Start: Solve the
following equation
for the y-axis:
W  max
How can the position of an object be quantified in terms of its potential energy?
START Derivation
W  max
Wgravity  mgy
Wgravity  mg y  y0 
Wgravity  mgy0  mgy
If y > y0, then gravity does negative work (aka. The
object moves in the opposite direction of gravity and
energy is “stored” in the object by exerting an
external force).
If y < y0, then gravity does positive work (aka. The
object moves in the same direction as gravity).
How can the position of an object be quantified in terms of its potential energy?
6-4 Potential Energy
An object can have potential energy by virtue of
its surroundings.
Familiar examples of potential energy:
• A wound-up spring
• A stretched elastic band
• An object at some height above the ground
• and Donuts!!!
How can the position of an object be quantified in terms of its potential energy?
6-4 Potential Energy
In raising a mass m to a height
h, the work done by an external
force is Wext  Fext d cos  mgh
Wext  mg y  y0 
(6-5a)
We therefore define the
gravitational potential energy:
Ugrav  mgy or PEgrav  mgy (6-6)
Does this go against our START
Activity where Wgrav  mgy?
Note that Wgrav  Ugrav
How can the position of an object be quantified in terms of its potential energy?
6-4 Potential Energy
This potential energy can become kinetic energy
if the object is dropped.
Potential energy is a property of a system as a
whole, not just of the object (because it depends
on external forces).
If
, where do we measure y from?
It turns out not to matter, as long as we are
consistent about where we choose y = 0. Only
changes in potential energy can be measured.
How can the position of an object be quantified in terms of its potential energy?
6-4 Potential Energy
Potential energy can also be stored in a spring
when it is compressed; the figure below shows
potential energy yielding kinetic energy.
How can the position of an object be quantified in terms of its potential energy?
6-4 Potential Energy
The force required to
compress or stretch a
spring is:
(6-8)
where k is called the
spring constant, and
needs to be measured for
each spring.
This equation is
known as Hooke’s Law
Steve Vai: “Crossroads”
How does the transformation of energy affect the total energy of a closed system?
Hooke’s Law
This is not to be confused with:
Hook-meets-Peter-Banning-Attorney-At-Law
QuickTime™ and a
H.264 decompressor
INSERT
CLIP
are needed to VIDEO
see this picture.
Youtube address
How does the transformation of energy affect the total energy of a closed system?
Hooke’s Law
or with:
T. J.-Hook-er-Enfor-s-er-of-the-Law
How can the position of an object be quantified in terms of its potential energy?
6-4 Potential Energy
The force increases as the spring is stretched or
compressed further. We find that the potential
energy of the compressed or stretched spring,
measured from its equilibrium position, can be
written:
(6-9)
How does the transformation of energy affect the total energy of a closed system?
Story Time with Mr. Seuss
What are two examples of potential energy in this story?
QuickTime™ and a
decompressor
are needed to see this picture.
http://www.youtube.com/watch?v=wKlynOMLWw0
How can the position of an object be quantified in terms of its potential energy?
Pasco Hooke’s Law LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
How can the position of an object be quantified in terms of its potential energy?
WebAssign/Lab Time
• Work on WebAssign Problems 6.1 - 6.10, the Pasco Work and
Energy Lab, or the Pasco Hooke’s Law Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
How can the position of an object be quantified in terms of its potential energy?
Summary
• Answer the Essential Questions.
• Ticket out the Door:
– What is the equation for gravitational
potential energy?
– What is the equation for elastic potential
energy?
– Why is the equation for Hooke’s Law
negative?
• HW:
– Pasco Hooke’s Law Lab (Questions and
Conclusions)
– WebAssign Problems 6.1 - 6.10
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 4
Conservative Forces and
Nonconservative Forces;
Conservation of Mechanical
Energy
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
COE: Conservation of
Mechanical Energy
EQ(s): How does the transformation of energy affect
the total energy of a closed system?
Start: Solve the following
equation for gy, multiply
both sides by mass, m (Do
not cancel out m), and
then set the final
conditions equal to the
initial conditions:
v2  v02  2gy
How does the transformation of energy affect the total energy of a closed system?
START Derivation
2
 v2 v2 2v0
v2 02
2g
g y  y0 
m  v  v0 mg
 2 2
1 2 1 2
mv  mv0  mgy0  mgy
2
2
1 2
1 2
mv0  mgy0  mv  mgy
2
2
K 0  U0  K  U
1 2
y  y0 : (v  v02 )  g 1m  2m   g v  v0
2
1 2
y  y0 : (v  v02 )  mg 3m  2m   mg v  v0
2
How does the transformation of energy affect the total energy of a closed system?
6-5 Conservative and Nonconservative
Forces
If friction is present, the work done depends not
only on the starting and ending points, but also
on the path taken. Friction is called a
nonconservative force.
How does the transformation of energy affect the total energy of a closed system?
6-5 Conservative and Nonconservative
Forces
Potential energy can
only be defined for
conservative forces.
How does the transformation of energy affect the total energy of a closed system?
6-5 Conservative and Nonconservative
Forces
Therefore, we distinguish between the work
done by conservative forces and the work done
by nonconservative forces.
We find that the work done by nonconservative
forces is equal to the total change in kinetic and
potential energies:
(6-10)
How does the transformation of energy affect the total energy of a closed system?
6-6 Mechanical Energy and Its
Conservation
If there are no nonconservative forces, the sum
of the changes in the kinetic energy and in the
potential energy is zero – the kinetic and
potential energy changes are equal but opposite
in sign.
This allows us to define the total mechanical
energy:
And its conservation:
(6-12b)
How does the transformation of energy affect the total energy of a closed system?
6-7 Problem Solving Using Conservation of
Mechanical Energy
In the image on the left, the total
mechanical energy is:
The energy buckets (right)
show how the energy
moves from all potential to
all kinetic.
How does the transformation of energy affect the total energy of a closed system?
6-7 Problem Solving Using Conservation of
Mechanical Energy
1
0
(Example 1) Determine the total
mechanical energy at the top of
the building, E0, and at the top
of his jump, E1:
E0  E1
K000  U SS00 U
K
UGGG000  KK111U
U
US1S1S1U
UU
G1
G1
G1
1 2
1 2
mv0  mgy0  mv1  mgy1
2
2
How does the transformation of energy affect the total energy of a closed system?
6-7 Problem Solving Using Conservation of
Mechanical Energy
(Example 2) Determine the total
mechanical energy at the top of
his jump, E1, and as he just
touches the trampoline, E2:
E1  E2
1
2
K111  U S1
 U G1
 K  UUSS2S22U
K
UU
GG2G
S1  UG1
G1  K222  U
22
1 2
1 2
mv1  mgy1  mv2  mgy2
2
2
How does the transformation of energy affect the total energy of a closed system?
6-7 Problem Solving Using Conservation of
Mechanical Energy
(Example 3) Determine the total
mechanical energy as he just
touches the trampoline, E2, and
as fully compresses the
trampoline, E3:
2
3
E2  E 3
K222U
USS22 U
K
K
UGG22  KK33 U
U
USS3S33U
UU
GG3G
33
1 2
1 2
mv2  mgy2  kx3
2
2
How does the transformation of energy affect the total energy of a closed system?
6-7 Problem Solving Using Conservation of
Mechanical Energy
(Example 4) If there is no
the speed of
E0 friction,
E1
a roller coaster will depend only on its height
USS00  UG 0  K1  U
KK0 0U
US1S1UU
G1G1
compared to its starting height.
1 2
mgy0  mv1
0
2
v1  2gy0
1
How does the transformation of energy affect the total energy of a closed system?
6-7 Problem Solving Using Conservation of
Mechanical Energy
(Example 5): Using conservation of mechanical
energy for an elastic force at the start of the pole
vault, E0, and at the top of the pole vault, E1:
1
E0  E1
K000 U
USSS000  UGG00  K
K
K111U
U
US1S1S1U
UU
G1
G1
G1
1 2 1 2 1 2
mv0  kx0  mv1  mgy1
2
2
2
0
How does the transformation of energy affect the total energy of a closed system?
Pasco Hooke’s Law LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
How does the transformation of energy affect the total energy of a closed system?
WebAssign/Lab Time
• Work on WebAssign Problems 6.1 - 6.14, the Pasco Work and
Energy Lab, or the Pasco Hooke’s Law Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
How does the transformation of energy affect the total energy of a closed system?
Summary
• Answer the Essential Questions.
• Ticket out the Door:
– A block of mass m slides without friction along the looped track. If
the block is to remain on the track, even at the top of circle (whose
radius is r), from what minimum height h must it be released?
• HW:
– Pasco Hooke’s Law Lab (Questions and Conclusions)
– WebAssign Problems 6.1 - 6.14
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 5
Conservation of Energy
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• Yesterday’s TOTD
A block
“car” of
of mass
mass m
m rolls
slides
without
without
friction
friction
along
along
the
the
looped
looped
track.
track.If If
the block
car is to
is to
remain
remain
onon
thethe
track,
track,
even
even
at at
thethe
toptop
of of
circle
circle
(whose
(whose
radius is r), from what minimum height h must it be released?
0
222
111
vv
m
FvF  rg
mg
rr
2
1
G
v1
y0
E0  E1
USS00  UG 0  K1  U
KK0 0U
US1S1 UUG1G1
1
FG
r
1 111 2 2
mgy
gygy
rg
mv
rg
v1 
g2rg
gy
mgy
2r
mgy
0gy
0
0000
1
1 11
2 222
5
y0  r
2
How does the transformation of energy affect the total energy of a closed system?
COE: Conservation of Energy
EQ(s): How does the transformation of energy affect
the total energy of a closed system?
Start: A bowling ball is hung
from the ceiling by a steel wire.
The instructor pulls the ball back
and stands against the wall with
the ball against his nose. To
avoid injury the instructor is
supposed to release the ball
without pushing it. Why?
How does the transformation of energy affect the total energy of a closed system?
6-8 Other Forms of Energy; Energy
Transformations and the
Conservation of Energy
Some other forms of energy:
Electric energy, nuclear energy, thermal energy,
chemical energy.
Work is done when energy is transferred from
one object to another.
In
other words,
theforms
Law of
of that
Accounting
for all
ofConservation
energy, we find
Energy
that
energy
is neither
created nor
the totalstates
energy
neither
increases
nor
destroyed,
is transferred
one object to
decreases. but
Energy
as a wholefrom
is conserved.
another.
E  E   E
1
2
n
How does the transformation of energy affect the total energy of a closed system?
6-9 Energy Conservation with Dissipative
Processes; Solving Problems
If there is a nonconservative force such as
friction, where do the kinetic and potential
energies go?
They become heat; the actual temperature rise of
the materials involved can be calculated.
Please enter . . . The Collision Balls
 U0 K
 KU
U  KWNCK 0KUUU0 FNC d
Recall thatKW0 NC
Fr cos180 
How does the transformation of energy affect the total energy of a closed system?
6-9 Energy Conservation with Dissipative
Processes; Solving Problems
Problem Solving:
1. Draw a picture.
2. Determine the system for which energy will
be conserved.
3. Figure out what you are looking for, and
decide on the initial and final positions.
4. Choose a logical reference frame.
5. Apply conservation of energy.
6. Solve.
How does the transformation of energy affect the total energy of a closed system?
Law of Conservation of Energy
Will the bowling ball hit his chin upon its return? Explain.
Where did the energy go?
How does the transformation of energy affect the total energy of a closed system?
Law of Conservation of Energy
Will the bowling ball hit his chin upon its return? Explain.
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are needed to see this picture.
Where did the energy go?
How does the transformation of energy affect the total energy of a closed system?
The Pendulum of Pain
Who puts their trust in Laws of Physics?
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How does the transformation of energy affect the total energy of a closed system?
The Pendulum of Pain
Who puts their trust in Laws of Physics?
How does the transformation of energy affect the total energy of a closed system?
Pasco Exp. 8: Projectile Velocity LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
INSERT LAB PICTURE
How does the transformation of energy affect the total energy of a closed system?
WebAssign/Lab Time
• Work on WebAssign Problems 6.1 - 6.17, the Pasco Work and
Energy Lab, Pasco Hooke’s Law Lab, or the Pasco Experiment
8: Projectile Velocity Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
How does the transformation of energy affect the total energy of a closed system?
Summary
• Answer the Essential Question.
• Ticket out the Door:
You drop a ball from a height of 2.0 m, and it
bounces back to a height of 1.45 m:
– What fraction of its initial energy is lost
during the bounce?
– What is the ball’s speed just as it leaves
the ground after the bounce?
– Where did the energy go?
• HW:
– Experiment 8: Projectile Velocity Lab
(Questions and Conclusions)
– WebAssign Problems 6.1 - 6.17
INSERT
PICTURE
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 6
Power
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
UNIT Title: Section Title
EQ(s):?
Start: ?
INSERT
Picture
EQ?
TITLE
INSERT NOTES HERE
6-10 Power
Power is the rate at which work is done –
(6-17)
In the SI system, the units of
power are watts:
The difference between walking
and running up these stairs is
power – the change in
gravitational potential energy is
the same.
6-10 Power
Power is also needed for acceleration and for
moving against the force of gravity.
The average power can be written in terms of the
force and the average velocity:
(6-17)
How does the transformation of energy affect the total energy of a closed system?
TITLE
(Thought Question)?
INSERT VIDEO CLIP
Youtube address
EQ?
LAB TITLE LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
INSERT LAB PICTURE
EQ?
LAB TITLE REPORT
•One Report for each group of no more than 4 people.
•Refer to the Laboratory Report Expectations Handout.
INSERT LAB PICTURE
EQ: ?
WebAssign/Lab Time
• Work on WebAssign Problems ?.?? - ?.?? (*Except ?.??), the
Lab Title Lab Report, or the Lab Title Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
EQ?
Summary
• Answer the Essential Questions.
• Ticket out the Door:
INSERT
PICTURE
• HW:
– Lab Title REPORT
– Lab Title Lab (Questions and Conclusions)
– WebAssign Problems ?.? - ?.?? (*Except ?.??)
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 7
Power
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
UNIT Title: Section Title
EQ(s):?
Start: ?
INSERT
Picture
EQ?
TITLE
INSERT NOTES HERE
How does the transformation of energy affect the total energy of a closed system?
TITLE
(Thought Question)?
INSERT VIDEO CLIP
Youtube address
EQ?
LAB TITLE LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
INSERT LAB PICTURE
EQ?
LAB TITLE REPORT
•One Report for each group of no more than 4 people.
•Refer to the Laboratory Report Expectations Handout.
INSERT LAB PICTURE
EQ: ?
WebAssign/Lab Time
• Work on WebAssign Problems ?.?? - ?.?? (*Except ?.??), the
Lab Title Lab Report, or the Lab Title Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
EQ?
Summary
• Answer the Essential Questions.
• Ticket out the Door:
INSERT
PICTURE
• HW:
– Lab Title REPORT
– Lab Title Lab (Questions and Conclusions)
– WebAssign Problems ?.? - ?.?? (*Except ?.??)
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 8
Work Day #2
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
LAB TITLE LAB
•Work in groups of no more than 4 people.
•Return all supplies to the counter/cart.
INSERT LAB PICTURE
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
LAB TITLE REPORT
•One Report for each group of no more than 4 people.
•Refer to the Laboratory Report Expectations Handout.
INSERT LAB PICTURE
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
WebAssign/Lab Time
• Work on WebAssign Problems ?.?? - ?.?? (*Except ?.??), the
Lab Title Lab Report, or Lab Title Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Summary
• Answer the Essential Questions.
• 3 - 2 - 1:
– 3 Things You know well for the test.
– 2 Questions you still have for the test.
– 1 Thing you enjoyed from this unit.
• HW:
– Lab Title REPORT
– Lab Title Lab (Questions and
Conclusions)
– WebAssign Problems ?.? - ?.?? (*Except
?.??)
INSERT
PICTURE
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 9
Summary / Work Day #3
After Attendance
•
•
•
•
•
•
Place HW on my desk
Pickup and sign out your computer
Log into www.plutonium-239.com
Select the Warm-Up link
Complete today’s warm-up and submit it
Logout and return the computer to the cart
Feed Back for Google Docs
• Was anything confusing on google docs?
• Noteworthy Student Responses
Review of Materials
• WebAssign Questions
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Summary of Chapter 6
• Work:
•Kinetic energy is energy of motion:
• Potential energy is energy associated with forces
that depend on the position or configuration of
objects.
•
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Summary of Chapter 6
• The net work done on an object equals the change
in its kinetic energy.
• If only conservative forces are acting, mechanical
energy is conserved.
• Power is the rate at which work is done.
UEQ #1: How do forces affect the motion of objects?
UEQ #2: What affects the forces acting on or between objects?
Summary of the Causes of Force
• Newton’s law of universal gravitation:
• Coulomb’s law:
• Satellites are able to stay in Earth orbit because
of their large tangential speed.
UEQ #1: How do forces affect the motion of objects?
UEQ #2: What affects the forces acting on or between objects?
†Causes of Force Essential Questions
• How does centripetal acceleration affect the motion of an object?
• What affects the strength of forces that act at a distance?
• How do the four fundamental forces dominate nature?
• How can we describe the motion of a satellite or planet?
• How are forces and pressure related for solids, liquids, and gases?
†Answer these before the test.
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
LAB TITLE REPORT
•One Report for each group of no more than 4 people.
•Refer to the Laboratory Report Expectations Handout.
INSERT LAB PICTURE
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
WebAssign/Lab Time
• Work on WebAssign Problems 6.1 - 6.22, the Lab Title Lab
Report, or Lab Title Lab
• Final Copy Criteria
–
–
–
–
–
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
• Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
†EQ/WebAssign/Lab
Time
•
†Answer the Essential Questions
•
Work on WebAssign Problems 6.1 - 6.22, the Lab Title Lab Report, or
the Lab Title Lab
•
Final Copy Criteria
–
–
–
–
–
•
State the problem (Ex. Find displacement)
Draw a picture/diagram
Provide a list or table of all given data (Ex. t = 2 s)
Solve the problem symbolically (Ex. v=x/t  x = vt)
Plug in numbers and units to obtain answer.
(Ex. x = (5 m/s)(2 s)= 10 m)
Notes about WebAssign:
– Positive vs. negative answers (Try a negative sign)
– Look at the final unit (hours or minutes or seconds)
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Summary
• Ticket out the Door:
Write down two questions and their answer for the test tomorrow and
turn it in.
– One conceptual problem
– One mathematical problem
• HW (Write down in your Student Planner):
–
–
–
–
–
Answer the Essential Questions
Lab Title Lab Report
Lab Title Lab (Questions and Conclusions)
WebAssign Problems 6.1 - 6.22
WebAssign Final Copy
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Day 10: Test
Conservation of Energy
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
†After
Attendance
•
Place HW on my desk (in Reverse Alphabetical Order):
WebAssign Final Copy
Essential Questions
Laboratory Assignment(s)
•
Pickup the following:
Chapter 7 Vocabulary Acceleration
Scantron Sheet
•
Fill in the following on the scantron sheet front:
Name: Write your name on it!!
Subject: PIM
Test: CEM1
Date: S10
Period: Block 2
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
†Conservation of Energy Test #1
• Do not write on Part I (the scantron questions)
• Put your name on Part II and complete it
• Verify any corrections below that have made before submitting
your test.
• Complete the Chapter 7 Vocabulary Acceleration
Test Corrections
• Question
UEQ: How does an object’s mass distribution and interactions with other
objects and force at a distance influence the object’s motion?
Summary
• Ticket out the Door:
Turn in the Conservation of Energy Test
• HW:
– Chapter 7 Vocabulary Acceleration
How does the transformation of energy affect the total energy of a closed system?
Law of Conservation of Energy
Will the bowling ball hit his chin upon its return? Explain.
QuickTime™ and a
decompressor
are needed to see this picture.
Where did the energy go?