NEWTON’S FIRST LAW OF MOTION
By Stacie Green
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We know that “motion” is any object that is
moving.
We know that we describe motion in 3 ways:
◦ HOW it moved
◦ The DIRECTION it moved
◦ The SPEED it moved
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To move something, a “force” has to happen.
A FORCE is a push or a pull
To get a toy car to move, the force of pushing
is applied as we push it across the floor.
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We can get it to move, but now how do we
get it to stop?
An object will stop when it loses speed or
“momentum.”
An object will stop when a “force” acts and
stops it.
Our toy car stops when it runs into the wall.
What else makes something stop…
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We know that friction can help objects
stop.
Friction is when 2 objects rub
together.
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Friction can help you-tennis shoes on the
gym floor so you have grip and won’t fall
down.
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Friction can hurt you-sock feet on the dance
floor and you slide into a wall.
The friction from the carpet and wheels on
the toy car help it lose speed, slow down, and
stop.
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An object is at rest when it is still.
A force is still acting on the object to keep it
still and keep it in place.
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GRAVITY
Gravity pulls objects DOWN.
Gravity is what keeps you in your seat, brings
your ball back down, and you back down after
you jump.
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We know how something moves and how
something stops.
We know that a force is a push or pull that
makes things move.
We know friction is 2 objects rubbing
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We know gravity pulls/pushes everything
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There’s more to motion-Let’s find out…
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together.
back down.
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You have a hockey puck
It is not moving, it is at rest
To get the puck to move, you have to do
something to the puck like hit it. This is the
force.
Without the force, it will stay in the same spot
and be at rest.
Watch this to learn more!
..\Desktop\Newton_s_First_Law_of_Motion.as
f
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“An object at rest remains at rest
unless acted on by another force.”
An object will stay at rest or “look still” until
you do something to make it move.
The toy car stays at the starting line (at rest)
until you push it (apply a force).
The hockey puck sits on the ice (at rest) until
you push it with the stick (apply a force).
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Think of a train-that train drives down a
straight track and stays going in a straight
direction.
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What happens when the track curves left or
right?
The train turns and goes left or right
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“An object in motion in a straight line
tends to say in motion in a straight
line unless acted upon by another
force.”
An object will go straight until a force makes
it go another direction.
Your paper airplane flies straight until gravity
pushes it down.
Thomas drives straight until the driver makes
it “turn” with the track.
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Let’s see what we’ve learned so far about
motion!
Give this quiz a try and test your motion
knowledge!
A.
Any object that is moving.
B.
Any object that flies.
C.
Any object that drives on the road.
D.
Any object this is sitting still.
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You’re right!
Motion is described as any object that
is moving!
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Anything that is moving is in motion.
We can say motion is any object that is
moving.
 Try the question again!!
A.
A pull
B.
Turning the key
C.
Throwing it
D.
A push
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We have to “push” the toy car to put it
into motion!
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You’ve really been paying attention!!
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Think about what we have to do to get that
toy car moving.
 It won’t move by itself, we have to do
something to get it to move.
Our forces are push and pull, which one will
make the car move forward?
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Go back and try it again!!
A.
Speed, how fast, and how far
B.
Speed or how fast or slow an object moves
C.
At rest or not at rest and the direction
D.
Speed, direction, and how it is moving
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We describe an object’s motion by
saying how fast or slow it goes, the
direction it goes in, and by saying
“how” it is moving.
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Try another question!
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When an object is moving, we describe “how”
it is moving, how fast or slow it is going, and
the direction is it moving.
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Try the question again!
A.
When 2 objects rub together causing it to
slow down or stop.
B.
A type of genre
C.
A force that makes things move
D.
A story you would write
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Friction is when 2 things rub together.
Friction is one reason why things stop
or slow down!
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Way to go!!!
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Friction is why you slide on your sock feet in
the dance studio or slide on ice.
 Friction is why the marbles would spin in
space, but not on the carpet.
 Friction is 2 things rubbing together.
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Try it again!
A.
Remain at rest until a force acts on it or
something makes it move
B.
Start moving by itself
C.
Push or pull itself
D.
Be out of energy
You’re Right!
 An object at rest will stay that way
until a force acts on it.
 Your hockey puck stays still until you
hit it with the stick!
 Let’s do another one!
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Think of your hockey puck
 When it is sitting on the ice, is it moving?
Does it move by itself or do you have to hit it
with your stick?
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Go back and try the question again!
A.
Gravity
B.
Friction
C.
No wind
D.
Poor design
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YES! The airplane lands because
gravity is pushing it down!
Keep at it! You’re doing a great job!!
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Gravity is the force that pulls everything down
to Earth.
 Gravity will act on the paper airplane and
push it down.
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Try the question again!
A.
It falls
B.
It stops moving
C.
Another force acts on the object and
changes the direction.
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You’ve really got it!!
Thomas stays straight until the driver
turns him (force would be pushing) to
curve with the track!
Thomas the Train moves down the straight
railroad track.
 He doesn’t turn to match the track on his
own.
A force is applied (the driver turning him) and
makes him curve with the track.
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Go back and try it again!
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YOU DID IT!!
You really know your stuff!
You made it through with flying colors!
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No doubt you’ll do great on your paper
assessment too!!
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Sounds are courtesy of Microsoft Clip Art
Pictures courtesy of the following: Microsoft
Clip Art,
http://www.freefever.com/animatedgifs/cars.
html, clipart-for-free.blogspot.com,
Image.google.com, and Green family photos
Video courtesy of Discovery Education