Action and Reaction Pairs: Newton's Third Law

A book rests on a table.  The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from accelerating downward ?

• The table presses back up on the book with an equal and opposite force of 20 newtons.

• The table presses back up on the book with a force greater than 20 newtons.

• The table and the book together are accelerating downwards at  9.8 m/sec²

• The inertia of the book holds it up

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You hit a wall with a stick.  The equal but opposite reaction is _____

• the wall pushes against you

• the stick pushes against you

• you push against the stick

• the wall pushes against the stick

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When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?

• The cannon moving forward

• The cannonball moving forward

• The cannon moving backward

• The cannonball moving backward

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A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.

• Every mass exerts a force on every other mass.

• An object at rest tends to stay at rest.

• Friction opposes the motion of an object.

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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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A player throws a ball. The action force is the player impact on the ball. The reaction force is...

• The force of the ball impact on the player

• The force of the grip of the ball

• The celebration the player is thinking of

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A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction force is...

• The grip of the player's hands on the ball

• the air resistance of the ball

• the force of the ball against the bat

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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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A rocket pushes exhaust 10, 000 N. Without any other forces acting on the rocket, how much force does the rocket go forward?

• 15,000 N

• 1,000 N

• 10, 000 N

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Newton's Third Law is also known as...

• The Law of Inertia

• The Law of Acceleration

• The Law of Conservation of Momentum (Force Pairs)

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