Newton's 3rd Law

A photograph of a bird perched on a fence post is shown.

Which description best identifies the action-reaction pair between the bird and the fence post?

• Action: The force of the bird on the wires

  Reaction: The force of the wires on the fence post

• Action: The force of the wires on the fence post

  Reaction: The force of the fence post on the bird

• Action: The force of the fence post on the bird

  Reaction: The force of the bird on the wires

• Action: The force of the bird on the post

  Reaction: The force of the fence post on the bird

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An ice skater pushes off a wall and glides backwards for a few meters and then stops.

Which statement best describes an action-reaction force pair in this statement?

• The friction of the ice decreases as the blade of the skate moves on the ice.

• The wall pushes on the skater as the skater pushes on the wall.

• The ice skates slow down, and the skater stops

• The skaters exerts a force on the wall, and blade exerts a force on the ice.

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Which Newton's Law best describes this statement, for every action there is an equal and opposite reaction?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

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How is this an example of Newton's 3rd Law?

• Only the ball is applying force to the soccer player's head.

• Only the soccer player's head is applying force to the ball.

• An equal force are being applied by the ball and the soccer player's head on each other.

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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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A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, opposite direction

• 200 Newtons, same direction

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A semi truck and a Volkswagen (small car) traveling at the same speed have a head on collision. Which statement is correct?

• The impact force is greater on the Volkswagen.

• The impact force is greater on the semi truck.

• The impact force is less on the semi truck.

• The impact force is equal for both.

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The rocket engines ignite and push the gases downward, what is the movement of the rocket?

• The rocket moves upward

• Mass of the rocket decreases

• The gases cause a reduction in air resistance

• The rocket moves downward

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