This document discusses Newton's three laws of motion and provides examples to illustrate each law. Newton's 1st law is demonstrated by a car hitting a tree. The 2nd law is shown by the greater force needed to accelerate a larger Hummer compared to a smaller car. Newton's 3rd law is exemplified by the equal and opposite forces exerted between a swimmer's arm and the water, as well as between a ball and a boy's hand. Further examples apply each law to additional images showing interactions between a dog and ground, a water hose, and a football player kicking a ball.

1. Which Law??
• 1st Law: The car
was in motion until
an unbalanced force
acted on it. In this
instance, the tree is
the unbalanced
force.
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2. The Hummer takes longer to accelerate to
70 mph.
Which Law??
• 2nd Law: Because
the Hummer has a
larger mass, it takes
a much greater
force to accelerate it
than it does the
small car.
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QuickTime™ and a
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3. Which Law??
• 3rd Law: As the
swimmer’s arm pulls
back on the water,
the swimmer is
propelled forward.
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4. Explain this picture according to
Newton’s 1st law.
• Newton’s first law says
that an object in motion
stays in motion until an
unbalanced force acts
on it. The unbalanced
force in this picture is the
pole. It is what caused
the car to quit moving.
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5. Explain this picture according to
Newton’s 3rd law.
• Forces act in equal and
opposite pairs is what
Newton’s 3rd law says.
In this picture, the ball is
exerting a force on the
boy’s hand. So the
opposite force would be
the hand exerting a force
back on the ball.
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6. Which law do you feel this picture
represents best? Explain.
• 3rd. The dog and the boy
are exerting a force down on
the ground because of
gravity. That is the action
force. The reaction force is
the ground exerting a force
back up on the dog and the
boy. If the forces weren’t
equal and opposite they
would fall through the earth
or be thrown up in the air.
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7. Which law do you feel this picture
represents best? Explain.
• 3rd: The water is pushed out
of the hose with a lot of
force. That is the action
force. The reaction force is
the hose moving backwards.
Therefore, it takes more than
one firefighter to hang onto
the hose to keep it from
‘dancing’ around on the
ground.
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are needed to see this picture.

8. Which law do you feel this picture
represents best? Explain.
• 2nd: The football is
accelerating in the direction
of the applied force which is
the football players foot.
TIFFQ (uUicnkcTomimper™ess aendd) daecompressor are needed to see this picture.
• 3rd: His foot is applying a
force on the football, and the
ball is applying a force back
on his foot.