Transcript Inertia - Science PowerPoints

• This PowerPoint is one small part of my Laws of
Motion and Simple Machines entire unit that I
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includes…
• A 3 Part 1,500+ Slide PowerPoint
• 15 Page bundled homework package and 11
pages of units notes that chronologically follow
the PowerPoint
• 2 PowerPoint review games, 20 Videos / Links,
rubrics, games, activity sheets, and more.
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ws_Motion_Machines_Unit.html
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• RED SLIDE: These are notes that are very
important and should be recorded in your
science journal.
Copyright © 2010 Ryan P. Murphy
-Nice neat notes that are legible and use indentations
when appropriate.
-Nice neat notes that are legible and use indentations
when appropriate.
-Example of indent.
-Nice neat notes that are legible and use indentations
when appropriate.
-Example of indent.
-Skip a line between topics
-Nice neat notes that are legible and use indentations
when appropriate.
-Example of indent.
-Skip a line between topics
-Make visuals clear and well drawn.
-Nice neat notes that are legible and use indentations
when appropriate.
-Example of indent.
-Skip a line between topics
-Make visuals clear and well drawn. Please label.
Resistance Arm
Effort Arm
• RED SLIDE: These are notes that are very
important and should be recorded in your
science journal.
• BLACK SLIDE: Pay attention, follow
directions, complete projects as described
and answer required questions neatly.
Copyright © 2010 Ryan P. Murphy
• Keep an eye out for “The-Owl” and raise
your hand as soon as you see him.
– He will be hiding somewhere in the slideshow
Copyright © 2010 Ryan P. Murphy
• Keep an eye out for “The-Owl” and raise
your hand as soon as you see him.
– He will be hiding somewhere in the slideshow
“Hoot, Hoot”
“Good Luck!”
Copyright © 2010 Ryan P. Murphy
Laws of Motion and Machines Unit
Copyright © 2010 Ryan P. Murphy
• Sir Isaac Newton (1642-1727), mathematician
and physicist, one of the foremost scientific
intellects of all time.

Newton’s 1st Law
 An
object at rest tends to stay at rest and an
object in motion tends to stay in motion with
the same speed and in the same direction
unless acted upon by an unbalanced force.
 Called Law of Inertia
Copyright © 2010 Ryan P. Murphy

Newton’s 1st Law
 An
object at rest tends to stay at rest and an
object in motion tends to stay in motion with
the same speed and in the same direction
unless acted upon by an unbalanced force.
 Called Law of Inertia
Copyright © 2010 Ryan P. Murphy

Inertia: Forces that resist to motion.
Copyright © 2010 Ryan P. Murphy
Inertia
– An object in motion tends to stay in motion unless
acted on upon by an unbalanced force.
– An object at rest tends to stay at rest unless acted
on by a force.
Copyright © 2010 Ryan P. Murphy
Inertia
– An object in motion tends to stay in motion unless
acted on upon by an unbalanced force.
– An object at rest tends to stay at rest unless acted
on by a force.
Copyright © 2010 Ryan P. Murphy
Inertia
– An object in motion tends to stay in motion unless
acted on upon by an unbalanced force.
– An object at rest tends to stay at rest unless acted
on by a force.
Copyright © 2010 Ryan P. Murphy
Inertia
– An object in motion tends to stay in motion unless
acted on upon by an unbalanced force.
– An object at rest tends to stay at rest unless acted
on by a force.
Copyright © 2010 Ryan P. Murphy
Inertia
– An object in motion tends to stay in motion unless
acted on upon by an unbalanced force.
– An object at rest tends to stay at rest unless acted
on by a force.
Copyright © 2010 Ryan P. Murphy
Inertia
– An object in motion tends to stay in motion unless
acted on upon by an unbalanced force.
– An object at rest tends to stay at rest unless
acted on upon by an unbalanced force.
Copyright © 2010 Ryan P. Murphy
• Activity! Try to pull the sheet of paper out
from under a stack of Dominoes without
having them fall.
– How does this activity demonstrate Newton’s
First Law of Motion?
• Activity! Try to pull the sheet of paper out
from under a stack of Dominoes without
having them fall.
– How does this activity demonstrate Newton’s
First Law of Motion?
• Answer: The Dominoes are at rest and will remain
at rest. The paper was yanked quickly (Motion)
and stayed in motion. The Dominoes did not fall
because of Inertia and Newton’s First Law of
Motion.
• Prediction! What will happen if I strike the
bottom Domino very quickly with a ruler?
Copyright © 2010 Ryan P. Murphy
• Demonstration! Teacher will knock the bottom
Domino from the stack with their Samurai sword
(meter stick)
– How does this demonstration reflect Newton’s First
Law?
Copyright © 2010 Ryan P. Murphy
• Demonstration! Teacher will knock the bottom
Domino from the stack with their Samurai sword
(meter stick)
– How does this demonstration reflect Newton’s First
Law? Objects at rest tend to stay at rest unless acted
upon by an outside force.
Copyright © 2010 Ryan P. Murphy
“Help me pick up
the Dominos or
I’ll go all Newton
again!?”
• Activity! Place a quarter or other object on a
playing card that’s on top of a container.
– Flick the card out quickly and see if the object
can land in the cup.
Copyright © 2010 Ryan P. Murphy
• Activity! Place a quarter or other object on a
playing card that’s on top of a container.
– Flick the card out quickly and see if the object
can land in the cup.
Copyright © 2010 Ryan P. Murphy
• Activity! Place a quarter or other object on a
playing card that’s on top of a container.
– Flick the card out quickly and see if the object
can land in the cup.
Copyright © 2010 Ryan P. Murphy
• Activity! Place a quarter or other object on a
playing card that’s on top of a container.
– Flick the card out quickly and see if the object
can land in the cup.
Copyright © 2010 Ryan P. Murphy
• Video Link! (Optional) Khan Academy
– Newton’s (Galileo) First Law of Motion
– Advanced
• http://www.khanacademy.org/video/newto
n-s-first-law-of-motion?playlist=Physics
• Demonstration! Accelerating Car
– Set-up a flatbed truck with some weight in the
back and attach each end with bungees or
heavy elastics.
• Cut one side or quickly remove.
• What happens? How does this relate to Newton’s
First and Third Law?
• Demonstration! Accelerating Car
– Set-up a flatbed truck with some weight in the
back and attach each end with bungees or
heavy elastics.
• Demonstration! Accelerating Car
– Set-up a flatbed truck with some weight in the
back and attach each end with bungees or
heavy elastics.
• Answer: The heavy weight want to stay at rest and
don’t go into motion with the car. The car was
acted upon by a force (Stretched Elastic / PE)
• Demonstration! Place a ball on a scooter
board, move in a straight line, then turn
the scooter board to the side.
– What direction does the ball travel?
Petri-Dish taped
to Scooter
Copyright © 2010 Ryan P. Murphy
Answer: The ball rolled in a straight line
because an object in motion wants to stay
in motion and in the same direction.
• What is going to happen to Mr. Test Tube?
• What is going to happen to Mr. Test Tube?
• What is going to happen to Mr. Test Tube?
• What is going to happen to Mr. Test Tube?
• What is going to happen to Mr. Test Tube?
• Demonstration: Let’s create our own
version of Mr. Test Tube.
• Demonstration: Let’s create our own
version of Mr. Test Tube.
• Demonstration: Let’s create our own
version of Mr. Test Tube.
• Demonstration: Let’s create our own
version of Mr. Test Tube.
• Video! Crash Test with and without seatbelts.
– An object in motion will stay in motion
– http://www.youtube.com/watch?v=d7iYZPp2zYY
• Approximately 35,000 people die in motor
vehicle crashes each year.
– About 50 percent (17,000) of these people could
have been saved if they wore their safety belts.
• Approximately 35,000 people die in motor
vehicle crashes each year.
– About 50 percent (17,000) of these people could
have been saved if they wore their safety belts.
• Wear a seatbelt! There is room to live inside
of the car. Newton’s first law can be deadly if
you get in a car accident.
Copyright © 2010 Ryan P. Murphy
• Wear a seatbelt! There is room to live inside
of the car. Newton’s first law can be deadly if
you get in a car accident.
– Especially if you are ejected.
Copyright © 2010 Ryan P. Murphy
• What is the force keeping the earth from
flying into deep space?
Copyright © 2010 Ryan P. Murphy
• What is the force keeping the earth from
flying into deep space? Gravity
Copyright © 2010 Ryan P. Murphy
• Inertia shows us that matter wants to
travel in a straight line.
Copyright © 2010 Ryan P. Murphy
When should the
pilot release the
bomb to hit the
target?
A
When should the
pilot release the
bomb to hit the
target?
B
C
• Are we ready!
• Bombs Away!
A
B
C
• Because of gravity, many objects thrown
through the air have a parabolic trajectory.
Copyright © 2010 Ryan P. Murphy
• Demonstration: Which will fall the fastest if
dropped at the same time?
• Demonstration: Which will fall the fastest if
dropped at the same time?
• Demonstration: Now place the dollar on
top of the book and repeat?
• Objects with similar air resistance fall at
the same rate.
– Everything falls at the same rate of speed in a
vacuum.
– That rate is the gravitational constant.
• On Earth (9.8 m/sec2)
• Video! Falling Objects, Gravity, Air
Resistance, on the moon with Apollo.
– http://www.youtube.com/watch?v=KDp1tiUsZ
w8
• In space, away from the gravity of Earth,
you will keep going in one direction until
acted upon by another force.
Explain Newton’s first law with a few
sentences about this picture?
Copyright © 2010 Ryan P. Murphy
• Answer! The apple was in a state of rest
until acted upon by an outside force which
happened to be a very large ant.
Copyright © 2010 Ryan P. Murphy
• What do you feel when you go around a sharp
curve at high speeds? (Dangerous and should
only be done by professionals.)
Copyright © 2010 Ryan P. Murphy
• What do you feel when you go around a sharp
curve at high speeds? (Dangerous and should
only be done by professionals.)
Copyright © 2010 Ryan P. Murphy
• What do you feel when you go around a sharp
curve at high speeds? (Dangerous and should
only be done by professionals.)
Copyright © 2010 Ryan P. Murphy
• The word for this pulling force that you feel is
called “inertia.”
Copyright © 2010 Ryan P. Murphy
 Inertia:
The property of matter by
which it retains its state of rest or its
velocity along a straight line.
• Inertia: The property of matter by
which it retains its state of rest or its
velocity along a straight line.
– So long as it’s not acted upon by an
external force.
• Glenn Howard's last shot in a round robin
game against Saskatchewan at the 2009
Brier is considered to be one of the best
curling shots ever.
• Glenn Howard's last shot in a round robin
game against Saskatchewan at the 2009
Brier is considered to be one of the best
curling shots ever. (Double Ricochet)
• Video Link. Let’s experience the shot.
– http://www.youtube.com/watch?v=-EswFKNXjMo
– How does Inertia apply here…
– Inertia: the property of matter by which it retains
its state of rest or its velocity along a straight
line so long as it is not acted upon by an external
force.
• Let’s hear it. Inertia as it applies to the
sport of curling.
• Activity! (Optional) Set-up a modified version
of curling by taping some colored paper to
your floor.
– Each table group elects one member to slide their
notebook across the floor and try to score for their table.
(Friction and Inertia)
– Pick an order, and your table group is allowed to knock
other notebooks out of the way.
– Whatever team is closest to the scoring area at the end
wins. Run it again in the opposite direction.
Inertia can pull a car off the road
or across the double line and into
on coming traffic.
• How does inertia apply to this racer?
• How does inertia apply to this racer?
• How does inertia apply to this racer?
• The driver must have the perfect lean
angle of the motorcycle so that the force of
gravity reaches equilibrium with the
centrifugal force attempting to stand the
bike back up.
• The driver must have the perfect lean
angle of the motorcycle so that the force of
gravity reaches equilibrium with the
centrifugal force attempting to stand the
bike back up.
– Driver must have an understanding where
their center of mass is.
• The driver must have the perfect lean
angle of the motorcycle so that the force of
gravity reaches equilibrium with the
centrifugal force attempting to stand the
bike back up.
– Driver must have an understanding where
their center of mass is.
?
• Center of Mass: Point in a body at which the
whole mass may be considered as
concentrated.
• Center of Mass: Point in a body at which the
whole mass may be considered as
concentrated.
– Usually associated with center of gravity. Similar
concepts on Earth.
• Activity: Use the Dominoes to recreate the
picture below.
– Try and get as far from the table as you can
before the center of gravity is off of the edge.
– Sketch your stack and draw a line where you
think the center of gravity / mass will be.
• Activity: Use the Dominoes to recreate the
picture below.
– Try and get as far from the table as you can
before the center of gravity is off of the edge.
– Sketch your stack and draw a line where you
think the center of gravity / mass will be.
• Activity: Finding the Center of Mass
• Activity: Finding the Center of Mass
– Put your hands together on your desk to
make a fulcrum point.
• Activity: Finding the Center of Mass
– Put your hands together on your desk to
make a fulcrum point.
– Place a meter stick on the fulcrum so it is
balanced.
• Activity: Finding the Center of Mass
– Put your hands together on your desk to
make a fulcrum point.
– Place a meter stick on the fulcrum so it is
balanced.
– Add a weight to one end and try to find the
new center of mass.
• Activity: Finding the Center of Mass
– Put your hands together on your desk to
make a fulcrum point.
– Place a meter stick on the fulcrum so it is
balanced.
– Add a weight to one end and try to find the
new center of mass.
• Activity! What is the maximum ml of water
that can be placed in an empty soda can and
still have lean on its side.
– Each group gets an empty soda can.
– Add water until you have the perfect center of
mass, measure the volume of liquid.
• Activity! What is the maximum ml of water
that can be placed in an empty soda can and
still have lean on its side.
– Each group gets an empty soda can.
– Add water until you have the perfect center of
mass, measure the volume of liquid.
• Activity! What is the maximum ml of water
that can be placed in an empty soda can and
still have lean on its side.
– Each group gets an empty soda can.
– Add water until you have the perfect center of
mass, measure the volume of liquid.
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo!
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo! Answer: Yes
– Will the ball land in the truck?
Copyright © 2010 Ryan P. Murphy
• Ballistics Car Demo! Answer: Yes
– Will the ball land in the truck?
Objects in motion want to stay in motion
and with the same speed, and in the
same direction.
Copyright © 2010 Ryan P. Murphy
• Let’s try it out with a ball and a person in a
office chair down the hallway.
Copyright © 2010 Ryan P. Murphy
• Let’s try it out with a ball and a person in a
office chair down the hallway.
Copyright © 2010 Ryan P. Murphy
• Video! Review! Newton’s 1st Law of Motion
ESA
– http://www.youtube.com/watch?v=Q0Wz5P0J
deU
• Activity! Answer with your feet.
A
B
Teacher needs to label the
corners of the room.
If you get a question wrong you have to sit.
If last person gets one wrong everyone
is back in.
C
D
A
B
Teacher needs to label the
corners of the room.
If you get a question wrong you have to sit.
If last person gets one wrong everyone
is back in.
C
D
A
B
Teacher needs to label the
corners of the room.
If you get a question wrong you have to sit.
If last person gets one wrong everyone
is back in.
C
D
A
B
Which is incorrect about energy…
A.) It’s the ability to do work
B.) Energy can cause something to change move
or directions
C.) Energy can be created and destroyed
D.) Energy quality is lost due to friction / force/
heat.
C
D
A
B
Which is incorrect about energy…
A.) It’s the ability to do work
B.) Energy can cause something to change move
or directions
C.) Energy can be created and destroyed
D.) Energy quality is lost due to friction / force/
heat.
C
D
A
B
Which law is this… The force produced by
the stretched spring is directly proportional to
the distance the spring is stretched compared
to its unstretched state F = -kx
A.) Newtons Law
B.) Hookes Law
C.) Charles Law
D.) Law of Thermodynamics
C
D
A
B
Which law is this… The force produced by
the stretched spring is directly proportional to
the distance the spring is stretched compared
to its unstretched state F = -kx
A.) Newtons Law
B.) Hookes Law
C.) Charles Law
D.) Law of Thermodynamics
C
D
A
B
All of the energy in the universe is…
A.) Decreasing in quality
B.) Being created by stars
C.) Destroyed by blackholes
D.) Multiplying daily
C
D
A
B
All of the energy in the universe is…
A.) Decreasing in quality
B.) Being created by stars
C.) Destroyed by blackholes
D.) Multiplying daily
C
D
A
B
Sir Isaac Newton lived…
A.) 1954-1986
B.) 901 – 967 B.C.
C.) 1642-1727
D.) None of the above
C
D
A
B
Sir Isaac Newton lived…
A.) 1954-1986
B.) 901 – 967 B.C.
C.) 1642-1727
D.) None of the above
C
D
• Sir Isaac Newton (1642-1727),
mathematician and physicist, one of the
foremost scientific intellects of all time.
A
B
Which law is this… Energy cannot be created
or destroyed, only converted between one form
and another.
A.) 1st Law of Motion
B.) Hookes Law
C.) Law of Migration
D.) Law Conservation Energy
C
D
A
B
Which law is this… Energy cannot be created
or destroyed, only converted between one form
and another.
A.) 1st Law of Motion
B.) Hookes Law
C.) Law of Migration
D.) Law Conservation Energy
C
D
A
B
Newton’s First Law of Motion is…
A.) Called the Law of Reaction.
B.) Called the Law of Inertia.
C.) Was found to be untrue.
D.) Uses Simple Machines.
C
D
A
B
Newton’s First Law of Motion is…
A.) Called the Law of Reaction.
B.) Called the Law of Inertia.
C.) Was found to be untrue.
D.) Uses Simple Machines.
C
D
A
B
Objects always wanna…
A.) Move at the speed of light.
B.) Resist Motion.
C.) Avoid Friction.
D.) Do-in what they ah do-in
C
D
A
B
Objects always wanna…
A.) Move at the speed of light.
B.) Resist Motion.
C.) Avoid Friction.
D.) Do-in what they ah do-in
C
D
“Dem objects are
just gonna keep
do-in what they
do-in!”
A
B
Part of Newton’s First Law describes…
A.) F = MA.
B.) Objects will always fall.
C.) An object at rest stays at rest.
D.) For action there is a reaction.
C
D
A
B
Part of Newton’s First Law describes…
A.) F = MA.
B.) Objects will always fall.
C.) An object at rest stays at rest.
D.) For action there is a reaction.
C
D
A
B
PE = mgh means that PE =
A.) movement x gravity x distance
B.) mass x height x movement
C.) height x object x gravity
D.) mass x gravity x height.
C
D
A
B
PE =
A.) ½ m x v
B.) Acceleration times distance
C.) mgh
D.) klm
C
D
A
B
PE =
A.) ½ m x v
B.) Acceleration times distance
C.) mgh
D.) klm
C
D
A
B
PE = mgh means that PE =
A.) movement x gravity x distance
B.) mass x height x movement
C.) height x object x gravity
D.) mass x gravity x height.
C
D
A
B
PE = mgh means that PE =
A.) movement x gravity x distance
B.) mass x height x movement
C.) height x object x gravity
D.) mass x gravity x height.
C
D
A
B
Inertia shows us that matter wants to
travel in a straight line.
A.) In a straight Line
B.) Against gravity
C.) Along a gradient
D.) Against the Parabolic trajectory
C
D
A
B
Inertia shows us that matter wants to
travel in a straight line.
A.) In a straight Line
B.) Against gravity
C.) Along a gradient
D.) Against the Parabolic trajectory
C
D
A
B
This pictures deals with an objects…
A.) Center of Mass
B.) Kinetic Energy
C.) Form of Energy
D.) Sir Isaac Newton
C
D
A
B
This pictures deals with an objects…
A.) Center of Mass
B.) Kinetic Energy
C.) Form of Energy
D.) Sir Isaac Newton
C
D
A
B
The driver must have the perfect lean angle of the
motorcycle so that the force of gravity reaches
equilibrium with the centrifugal force attempting to
stand the bike back up.
A.) gravitational constant
B.) centrifugal force
C.) center of mass
D.) None of the above
C
D
A
B
The driver must have the perfect lean angle of the
motorcycle so that the force of gravity reaches
equilibrium with the centrifugal force attempting to
stand the bike back up.
A.) gravitational constant
B.) centrifugal force
C.) center of mass
D.) None of the above
C
D
• Activity: Dueling Pendulums
– Lift one pendulum and release. What happened?
– Does this activity break Newtons First Law of
motion that an object at rest tends to stay at rest.
• Activity: Dueling Pendulums
– Answer: No, the swinging pendulums energy is
transferred to the still pendulum.
– Remember, Energy cannot be created or
destroyed but transferred between systems and
surroundings.
• Activity: Dueling Pendulums
– Answer: No, the swinging pendulums energy is
transferred to the still pendulum.
– Remember, Energy cannot be created or
destroyed but transferred between systems and
surroundings.
• Activity: Dueling Pendulums
– Answer: No, the swinging pendulums energy is
transferred to the still pendulum.
– Remember, Energy cannot be created or
destroyed but transferred between systems and
surroundings.

New mini area of focus:

New mini area of focus:

New mini area of focus: Friction
• Friction: Available Worksheet
• Friction: Available Worksheet

Friction: The resistance encountered when
one body is moved in contact with another.

The four types of friction
-
Copyright © 2010 Ryan P. Murphy

Static friction: Friction between two
surfaces that are not moving past each
other.
Copyright © 2010 Ryan P. Murphy

Sliding Friction: The force that opposes
the motion of two surfaces sliding past
each other.
Copyright © 2010 Ryan P. Murphy

Sliding Friction: The force that opposes
the motion of two surfaces sliding past
each other.
Copyright © 2010 Ryan P. Murphy

Sliding Friction: The force that opposes
the motion of two surfaces sliding past
each other.
Copyright © 2010 Ryan P. Murphy
• Video! Ice Storm (A world without Fricition)
– This is why you should not travel in an ice storm.
• http://www.youtube.com/watch?v=YCoxOReXlHI

Rolling friction: The friction between a
rolling object and the surface it rolls on.
Copyright © 2010 Ryan P. Murphy
• Only a small area is in contact.
Copyright © 2010 Ryan P. Murphy
• Which bike will be faster? Why?
Copyright © 2010 Ryan P. Murphy
• Which bike will be faster? Why? Where are we?
Copyright © 2010 Ryan P. Murphy
• Which bike will be faster? Why?
Copyright © 2010 Ryan P. Murphy
• Which bike will be faster? Why?
Road bike
 Light weight
 Small thin tires = less
friction, more aerodynamic

Copyright © 2010 Ryan P. Murphy
• Which bike will be faster? Why?
Road bike
 Light weight
 Small thin tires = less
friction, more aerodynamic

Mountain bike
 Heavy / Durable
 Wide tire with lots of
grip to increase friction.

Copyright © 2010 Ryan P. Murphy

Fluid friction: When an object is moving in
liquid or gas.
Copyright © 2010 Ryan P. Murphy
• Video (Optional)
– Tillman the skateboarding, skimboarding, and
surfing dog.
– This is just relaxing for the next four minutes of
our busy day.
– Examples of Sliding, Rolling, and Fluid Friction.
• People standing around are static friction.
– http://www.youtube.com/watch?v=fLclGPr7fj4
• Friction: Available Worksheet
• Quiz Wiz 1-10 Name that Friction
Copyright © 2010 Ryan P. Murphy
bbbbbbbbbbbbbbbbbbbb
• Bonus: Name the movie and the actor.
• Answers Quiz Wiz 1-10 Name that Friction
Copyright © 2010 Ryan P. Murphy
bbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbb
• –Bonus: Name the movie and the actor.
• –Bonus: Tom Hanks / Cast Away (2000)
• –Bonus: Tom Hanks / Cast Away (2000)

Aerodynamic: Designed or arranged to
offer the least resistance to fluid flow.
Copyright © 2010 Ryan P. Murphy
• Video (Optional) The worlds fastest bicycle
and aerodynamics.
– http://www.youtube.com/watch?v=5V2FgwN_re4
• The word drag refers to wind resistance.
– (The force acted upon a moving object by the
air or water)
• The word drag refers to wind resistance.
– (The force acted upon a moving object by the
air or water)
• The word drag refers to wind resistance.
– (The force acted upon a moving object by the
air or water)
• The word drag refers to wind resistance.
– (The force acted upon a moving object by the
air or water)

Hydrodynamic: A shape designed to move
efficiently through the water.
Copyright © 2010 Ryan P. Murphy
“Why does
a golf ball
have
dimples?”
• A golf ball has dimples to make it more air
resistant.
• A golf ball has dimples to make it less
resistant to the air.
– Thus travel further and straighter.
• A golf ball has dimples to make it less
resistant to the air.
– Thus travel further and straighter.
• A golf ball has dimples to make it less
resistant to the air.
– Thus travel further and straighter.
An object in
motion stays in
motion
No Dimples
• Those large caps on trucks help decrease
fluid friction with the air.
• Hurricane resistant building.
• Hurricane resistant building.
– This structure should survive massive wind
force and high water.
• Friction: Available Worksheet
• Aerodynamic Challenge!
– You and your team must design a covering
so that a box of tissues will not be toppled by
high wind.
• Aerodynamic Challenge!
– You and your team must design a covering
so that a box of tissues will not be toppled by
high wind.
• Covering can only be minimally secured to tissue
box.
Top View
Side View
Top View
Side View
Example
Top View
Side View
Example
Top View
Just example cover, not best design
Side View

Friction
 Slows
an object down until it stops
 Produces heat
 Wears object down
Copyright © 2010 Ryan P. Murphy

Friction
 Slows
an object down until it stops
 Produces heat
 Wears object down
Copyright © 2010 Ryan P. Murphy

Friction
 Slows
an object down until it stops
 Produces heat
 Wears object down
Copyright © 2010 Ryan P. Murphy
• Video (Optional) Making a Friction Fire.
– http://www.youtube.com/watch?v=Pg83ymYwTrE

Friction
 Slows
an object down until it stops
 Produces heat
 Wears object down
Copyright © 2010 Ryan P. Murphy

Friction
 Slows
an object down until it stops
 Produces heat
 Wears object down
Copyright © 2010 Ryan P. Murphy
• Friction Available Sheet.
• Activity! Examining the wear on your
treads from friction.
– Which parts of your show are most worn
down?
– Does this tell you anything about how you
walk?
Copyright © 2010 Ryan P. Murphy
• Some positives and negatives of friction.
• To start, stop, and change directions. +
• Heats things up +/– Engine wear, limitations in travel, can warm
hands
• Wears things down +/– Machines break, sandpaper / abrasives
• Activity! Sliding Friction
Copyright © 2010 Ryan P. Murphy
• Friction Available Sheet.
• Reminder before activity.
– Don’t forget to zero your spring scales.
How do different surfaces effect the force required
for a science journal to overcome friction.
Hypothesis?
1) Three trials on a lab table
2) Three trials on the rug
3) Three trials on the floor
Newtons
Newtons
Newtons
Lab Table
Rug
Floor
Copyright © 2010 Ryan P. Murphy
• Friction Available Sheet.
• This PowerPoint is one small part of my Laws of
Motion and Simple Machines entire unit that I
offer on TpT ($9.99)
• It is a shipped hard good that I email to you once
alerted to the purchase from TpT. This unit
includes…
• A 3 Part 1,500+ Slide PowerPoint
• 15 Page bundled homework package and 11
pages of units notes that chronologically follow
the PowerPoint
• 2 PowerPoint review games, 20 Videos / Links,
rubrics, games, activity sheets, and more.
• http://www.sciencepowerpoint.com/Newtons_La
ws_Motion_Machines_Unit.html