Newton's Law of Motion

Newton's Third Law States...

• Objects in motion stay in motion and objects at rest stay at rest

• Force is equal to mass times acceleration

• For each action there is an equal and opposite reaction

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NGSS.MS-PS2-1

An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow

• the arrow's push against the bowstring

• the grip of the archer's hand on the bow

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A baseball player bats a ball with a force of 1,000 N. The ball exerts a reaction force (without any additional forces action on it) against the bat of...

• Less than 1, 000 N

• 1,000 N

• More than 1,000 N

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What is the reaction force to a foot pushing down on the floor?

• The foot going through the floor

• The floor pushing back against the foot

• The floor breaking to the foot

According to Newton's Third law the strength or magnitude of forces will be...

• smaller

• equal

• larger

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NGSS.MS-PS2-1

Newton's _____ Law of Motion means that for every force there is a reaction force that is equal in size, but opposite in direction.

• First

• Second

• Third

• Fourth

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How many Laws of Motion are there?

• 1

• 2

• 3

• 4

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Who was the scientist who gave us the Laws of Motion?

• Sir Isaac Newton

• Albert Einstein

• Galileo Galilei

• Aristotle

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NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which best explains why we are able to accelerate forward when starting to run?

• As one leg moves backward, it provides an equal and opposite force for the other foot to move forward.

• No acceleration takes place. Runners are always at a fixed velocity.

• The striking foot pushes backward against the ground. The friction with the ground provides an equal and opposite force forward.

• The runner's upper body quickly leans forward, causing the entire body to begin accelerating forward

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

When a large truck pushes a small car with a given force, the small car is applying an equal and opposite force on the truck.

• True

• False

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