Understanding Newton's Third Law

Which of the following statements best describes Newton's Third Law of Motion?

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

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

• 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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DOK Level 1: Recall

If a person pushes a wall with a force of 50 N, what is the force exerted by the wall on the person?

• 0 N

• 25 N

• 50 N

• 100 N

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DOK Level 1: Recall

When a bird flies, it pushes the air downwards with its wings. According to Newton's Third Law, what happens next?

• The air pushes the bird forward.

• The air pushes the bird upwards.

• The air pushes the bird backwards.

• The air does not exert any force on the bird.

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DOK Level 1: Recall

A swimmer pushes the water backwards with her hands. What is the reaction force according to Newton's Third Law?

• The water pushes the swimmer forward.

• The water pushes the swimmer backward.

• The water pushes the swimmer downward.

• The water does not exert any force on the swimmer.

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DOK Level 1: Recall

Which of the following is an example of Newton's Third Law of Motion?

• A book resting on a table.

• A car accelerating on a highway.

• A rocket launching into space.

• A ball rolling down a hill.

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DOK Level 1: Recall

If a horse pulls on a cart with a force of 200 N, what is the force exerted by the cart on the horse?

• 0 N

• 100 N

• 200 N

• 400 N

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DOK Level 1: Recall

When you jump off a small boat into the water, the boat moves backward. Which law explains this observation?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Law of Conservation of Energy

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DOK Level 1: Recall

A hammer hits a nail with a force of 30 N. What is the force exerted by the nail on the hammer?

• 0 N

• 15 N

• 30 N

• 60 N

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DOK Level 1: Recall

Which of the following pairs of forces are examples of action-reaction pairs?

• The gravitational force between the Earth and the Moon.

• The force of a bat hitting a baseball and the force of the baseball on the bat.

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

• The tension in a rope during a tug-of-war.

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DOK Level 1: Recall

If a person stands on a skateboard and pushes against a wall, what will happen to the skateboard?

• It will move towards the wall.

• It will move away from the wall.

• It will not move at all.

• It will move in a circular path.

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DOK Level 1: Recall