Action Reaction

The picture is an example of Newton's...

• Apple Tree Hypothesis

• inability to swim, which later in life became his downfall

• 3rd Law of Motion

• 3rd Law of Buoyancy

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What does Newton's 3rd Law of Motion state?

• An object at rest stays at rest unless acted upon by an external force.

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

• The acceleration of an object is directly proportional to the net force acting on it.

• The force of gravity acts between all masses.

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Which of the following is an example of action and reaction forces?

• A book resting on a table.

• A rocket launching into space.

• A car accelerating on a highway.

• A person standing still.

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If you push against a wall with a force of 10 N, what is the force exerted by the wall on you?

• 0 N

• 5 N

• 10 N

• 20 N

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Which of the following is a force pair in nature according to Newton's 3rd Law?

• The gravitational pull between the Earth and the Moon.

• The friction between a car's tires and the road.

• The lift force on an airplane wing and the weight of the airplane.

• The thrust of a jet engine and the air pushed backwards.

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If a horse pulls on a cart with a force of 500 N, what is the force exerted by the cart on the horse?

• 250 N

• 500 N

• 750 N

• 1000 N

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Which of the following statements is true about action and reaction forces?

• They act on the same object.

• They are always equal in magnitude and opposite in direction.

• They cancel each other out.

• They act in the same direction.

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When a cannon fires a cannonball, we can observe Newton's 3rd Law. Which is the reaction force?

• The cannon moving forward

• The cannon moving backward

• The cannonball moving backward

• The cannonball moving forward

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Newton's 3rd law says that for every action, there is an ______ reaction.

• unequal & opposite

• equal & similar

• equal & opposite

• stronger & opposite

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

• Both the ball and his head are exerting equal forces on each other.

• Only his head is pushing on the ball.

• Only the ball is pushing on his head.

• This is not an example of Newton's 3rd Law.

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