Energy and Momentum MC Review

When comparing the momentum of two moving objects, which of the following is correct?

• The object with the higher velocity will have less momentum if the masses are equal.

• The more massive object will have less momentum if its velocity is greater.

• The less massive object will have less momentum if the velocities are the same.

• The more massive object will have less momentum if the velocities are the same.

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NGSS.HS-PS2-2

A roller coaster climbs up a hill at 4 m/s and then zips down the hill at 30 m/s. The momentum of the roller coaster

• is greater up the hill than down the hill.

• is greater down the hill than up the hill.

• remains the same throughout the ride.

• is zero throughout the ride.

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A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. The magnitude of the momentum of the rubber ball

• increased.

• decreased.

• remained the same.

• was not conserved.

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NGSS.HS-PS2-2

If a force is exerted on an object, which statement is true?

• A large force always produces a large change in the object’s momentum.

• A large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.

• A small force applied over a long time interval can produce a large change in the object’s momentum.

• A small force always produces a large change in the object’s momentum.

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The change in an object’s momentum is equal to

• the product of the mass of the object and the time interval

• the product of the force applied to the object and the time interval.

• the time interval divided by the net external force.

• the net external force divided by the time interval.

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Which of the following situations is an example of a significant change in momentum?

• A tennis ball is hit into a net.

• A helium-filled balloon rises upward into the sky.

• An airplane flies into some scattered white clouds.

• A bicyclist rides over a leaf on the pavement.

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NGSS.HS-PS2-2

In a two-body collision,

• momentum is always conserved.

• kinetic energy is always conserved

• neither momentum nor kinetic energy is conserved.

• both momentum and kinetic energy are always conserved.

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Two objects move separately after colliding, and both the total momentum and total kinetic energy remain constant. Identify the type of collision.

• perfectly elastic

• nearly elastic

• inelastic

• perfectly inelastic

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Two objects stick together and move with a common velocity after colliding. Identify the type of collision.

• perfectly elastic

• nearly elastic

• inelastic

• perfectly inelastic

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A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball?

• It maintains its initial velocity

• It has one-half its initial velocity

• It comes to rest.

• It moves in the opposite direction.

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