Momentum and Energy

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.

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.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

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.

Tags

NGSS.MS-PS3-1

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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NGSS.HS-PS2-1

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.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

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.MS-PS2-2

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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NGSS.HS-PS2-2

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.

Tags

NGSS.MS-PS2-1

What happens to the total energy of a moving object if all the applied forces are conservative forces?

• It increases

• It decreases

• It remains constant

• The velocity is required to answer this question

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which statement best describes the PE-KE transformations for a javelin, starting from the instant the javelin leaves the thrower's hand until it hits the ground.

• Initial PE is transformed to KE until the javelin reaches the high point of its arc. On the way back down, KE is transformed into PE. At every point in the flight, mechanical energy is being transformed into heat energy.

• Initial KE is transformed to PE until the javelin reaches the high point of its arc. On the way back down, PE is transformed into KE. At every point in the flight, mechanical energy is being transformed into heat energy.

• Initial PE is transformed to KE until the javelin reaches the high point of its arc. On the way back down, there is no transformation of mechanical energy. At every point in the flight, mechanical energy is being transformed into heat energy.

• Initial KE is transformed to PE until the javelin reaches the high point of its arc. On the way back down, there is no transformation of mechanical energy. At every point in the flight, mechanical energy is being transformed into heat energy.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5