Momentum Quiz

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 child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.

• Both the child and the bike have the same momentum.

• The bike has a greater momentum than the child.

• The child has a greater momentum than the bike.

• Neither the child nor the bike has momentum.

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.

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 produces a large change in the object’s momentum.

A ball with a momentum of 4.0 kg•m/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball’s momentum?

• -8.0 kg•m/s

• -4.0 kg•m/s

• 0.0 kg•m/s

• 8.0 kg•m/s

The impulse experienced by a body is equivalent to the body’s change in

• velocity.

• kinetic energy.

• momentum.

• force.

A 75 kg person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person

• increased.

• decreased.

• remained the same.

• was conserved.

Two skaters stand facing each other. One skater’s mass is 60 kg, and the other’s mass is 72 kg. If the skaters push away from each other without spinning,

• the lighter skater has less momentum.

• their momenta are equal but opposite.

• their total momentum doubles.

• their total momentum decreases.

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.

The law of conservation of momentum states that

• the total initial momentum of all objects interacting with one another usually equals the total final momentum.

• the total initial momentum of all objects interacting with one another does not equal the total final momentum.

• the total momentum of all objects interacting with one another is zero.

• the total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the objects.