Newton's Third Law and Momentum Review

Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.

• Always true

• Sometimes true

• Never true

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Forces always occur

• as single quantities

• in pairs

• by themselves

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If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into motion?

• Yes, because there is a net force acting on the wagon.

• Yes, because there is a time delay between action and reaction.

• No, because the forces cancel each other.

• Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse.

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NGSS.MS-PS2-2

A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force

• of the rocket on the exhaust gases.

• of the exhaust gases on the rocket.

• neither A nor B

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NGSS.MS-PS2-1

A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the

• road.

• engine.

• tires.

• air.

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NGSS.MS-PS2-2

A man pulls on a rope in a tug-of-war with an elephant . Each pulls with 500N of force. What is the tension in the rope?

• 0N

• 250N

• 25.0N

• 500N

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NGSS.MS-PS2-2

You drive past a farm, and you see a cow pulling a plow to till a field. You have just learned about Newton’s third law, and you wonder how the cow is able to move forward if the plow is exerting an equal and opposite force on the cow. Which of the following explains the movement of the cow and plow?

• The force exerted by the cow on the plow is equal to the force that the cow exerts on the ground to move forward.

• The force exerted by the cow on the plow is larger than the force that the cow exerts on the ground to move forward.

• The force exerted by the cow on the plow is smaller than the force that the cow exerts on the ground to move forward.

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Consider the picture shown above. Which is an action-reaction pair?

• A and C upon B, and B upon A and C

• A upon B and B upon A

• B upon C and A upon C

• A, B, and C are action-reaction forces

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A 100-kilogram ball is traveling at 2 m/s, and a 25-kilogram ball is traveling at 10 m/s. Which ball has the greater momentum?

• The 100 kg ball

• The 25 kg ball.

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NGSS.HS-PS2-2

The total momentum of two marbles before a collision is 0.06 kg x m/s. No outside forces act on the marbles. What is the total momentum of the marbles after the collision?

• 0.03 kg x m/s

• .6 kg x m/s

• .3 kg x m/s

• .06 kg x m/s

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