Transcript Chapter 2 Lesson 1

Chapter 2 Lesson 1
Objective
• Learn the two types of force
• Gravity vs mass vs weight
• Universal gravitation
• Three types of friction
Warm- Up
• What is the difference
between mass and weight?
Exit Ticket
1.
2.
3.
4.
5.
6.
7.
8.
Distinguish between a contact and non contact force.
Is force considered a vector?
What is a vector?
Use the word gravity when distinguishing between
mass and weight.
How does the force of gravity change with distance?
How does the force of gravity change with mass?
How does the force applied to an object and the force
of friction compare when an object is sliding?
How does the force applied to an object and the force
of friction compare when an object is static?
Chapter 2 Lesson 2
Objective
• Inertia
Warm- Up
• Look in your book and define
inertia….please also write down
my definition during notes.
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Inertia
• An object at rest stays at rest unless a net force acts
on it.
• An object in motion stays in motion unless acted on
by an equal and opposite force.
• An objects ability to resist change in motion.
Inertia Demos
• Write and answer the questions that I ask
….you will add this to your Exit Ticket and HW
to prove that you have completed the work
•
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Exit Ticket / HW
• Pg 59 1-9
Chapter 2 Lesson 2
Objective
• Practice Vector addition
Warm- Up
• Review Page 59
• Extra Credit for those of you
that are ready to go when
that late bell rings, paper
for notes out and HW also
out to be graded
Vector addition – class practice
1. A ship is heading due west at a speed of 15 km/h. A current
is heading due east at 3 km/h. Calculate the velocity. You
need magnitude and direction.
2. A ship is heading due west at a speed of 15 km/h. A current
is heading due west at 3 km/h. Calculate the velocity. You
need magnitude and direction.
3. A ship is heading due west at a speed of 15 km/h. A current
is heading due east at 15 km/h. Calculate the velocity. You
need magnitude and direction.
4. A ship is heading due east at a speed of 15 km/h. A current
is heading due west at 3 km/h. Calculate the velocity. You
need magnitude and direction.
5. A ship is heading due east at a speed of 15 km/h. A current
is heading due east at 3 km/h. Calculate the velocity. You
need magnitude and direction.
Skill Practice
• Complete page 60 with a partner. You may
share one paper between you and a partner.
• On step 6, the requirement for our class is to
complete 3 additional examples.
Chapter 2 Lesson 3
Objective
• F= ma – Newton’s 2nd Law
• Circular motion
• Centripetal vs centrifugal
Warm- Up
• What is the formula for
velocity?
• What is the formula for
acceleration?
F=ma mini Lecture to be used in lab
• You throw a 0.5 kg ball with an acceleration of
20 m/s2. What is the force applied?
Lab
f=ma
1. Measure the mass of the ball and the ping pong ball in grams.
Convert to kg. Record don’t forget units
.
2. Use a meter stick to measure the distance you want to roll each
ball in meters. Record , don’t forget units
.
3. Lay both balls on a flat surface. Push a meter stick against both
balls at the same time. A picture of this is found on page 68 in
your book.
4. Measure the time it takes each ball to make it to the end of the
distance you measured. Record, don’t forget units.
5. Repeat this 3 times to get an accurate and average time. Record,
don’t forget units
.
6. Now that you have distance and time you must fill in the data
table.
Mass in kg
Time trial 1
Time trial 2
Time trial 3
Average
time
Velocity
Acceleration
Force
Record
Your
Answers
Here
In
The
Data
Table
Chapter 2 Lesson 3
Objective
• F= ma
• Circular motion
• Centripetal vs centrifugal
Warm- Up
• Jeremy Wade is a biologist
and fresh water fisherman.
He has caught several VERY
large fish. One had a weight
of 400 lbs ( 180kg). If this
fish were to fly out of the
water and hit Jeremy what
force would the fish apply,
assuming it has an
acceleration of 1.2 m/s2)
Practice
Chapter 2 Lesson 4
Objective
• Newton’s 3rd law- action
reaction
Warm- Up
Look on page 71 and write
down Newton’s 3rd
Law…Record this at the top of
your lab paper
We will also write down his 1st
and second
Lab- you WILL need an objective and data, you WILL need the
analysis and conclusion. You will NOT need materials, safety or
procedure.
• You will complete the lab on Page 76-77.
• You will need all 3 of Newton’s Laws at the top of your
paper.
• You will need to write an objective that corresponds to your
activity. You will then need to have your data table
• Complete steps 1-8. You must create a data table to record
your results.
• You may SKIP steps 9 and 10
• Pick back up with step 11 and complete 11-14. Record your
results to #11 after you perform the activity….Don’t forget
to have is approved!!!
# 14 is very important- you must write Newton’s three laws
and how the motion of the lid relates to EACH law.
Lab- you WILL write a formal lab report.
• You will complete the lab on Page 76-77.
• You will need all 3 of Newton’s Laws at the top of your
paper.
• You will need to write an objective that corresponds to your
activity. Then the materials, safety and procedure.
• Complete steps 1-8. You must create a data table to record
your results.
• You may SKIP steps 9 and 10
• Pick back up with step 11 and complete 11-14. Record your
results to #11 after you perform the activity….Don’t forget
to have is approved!!!
# 14 is very important- you must write Newton’s three laws
and how the motion of the lid relates to EACH law.
Chapter 2 Lesson 4
Objective
• Newton’s 3rd law- action
reaction
• Momentum formula
• Conservation of momentum
Warm- Up
If a hammer hits a nail……then
the nail fill in the blank .
Momentum
Kahoot?
Practice
• 1. What is the momentum of an 8-kg bowling
ball rolling at 2 m/s?
• 2. What is the momentum of a 50-kg carton
that slides at 4 m/s across an icy surface
Conservation of Momentum
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Exit Ticket
• HW:
– Page 73
– Page 75
1 and 2 at the bottom (in blue box)
4 and 9