Newton's Third Law of Motion

When a person pushes against the ground with their foot, the equal and opposite reaction force is

• when they start to move forward

• the ground pushing back on their foot

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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?

• 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.

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

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What is the action in the picture?

• The man pushing against the wall

• The wall pushing back at the man

• The ground pushing against the man's foot

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

• Only the head is pushing on the ball

• Only the ball is using the head

• Both the ball and the head are exerting equal force on each other

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Action-reaction forces never cancel each other out because....

• they act on different objects

• they act on the same object

• they do not act on objects

When a heavy football player and a light football player run into each other, who exerts more force?

• The heavy one

• The light one

• They both exert an equal amount of force

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Forces always come in __________.

• Pairs

• Triplets

• Waves

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Action-reaction forces can cause a change in motion.

• True

• False

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This image illustrates Newton's third law. Newton's third law simply states that for every action there is an ______ and opposite reaction.

• opposite

• greater

• equal

• weaker

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What is Newton's Third Law also known as?

• The Law of Acceleration

• The Law of Inertia

• The Law of Action-Reaction

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