Physical Science 1.12: 3.2 Momentum & Collisions

Multiple Choice

How do these balls compare in terms of momentum just before the goalie stops them?

• They have the same momentum.

• The soccer ball has more momentum.

• The bowling ball has more momentum.

Multiple Choice

A cougar runs with a velocity of 8.0 m/s west. If the cougar has a momentum of 352 kg·m/s, what is its mass? (p=mv)

• 87 kg

• 28 kg

• 44 kg

• 0.020 kg

Multiple Choice

The mass of an arrow is 0.01 kg, and it has a momentum of 0.2 kg·m/s to the left. What is the velocity of the arrow?

• 10 m/s left

• 30 m/s left

• 40 m/s left

• 20 m/s left

Multiple Choice

What type of collision would this be:

A tennis ball gets hit by a wad of gum midair. They stick together and continue flying.

• Perfectly inelastic collision

• Elastic collision

• Inelastic collision

Multiple Choice

A student (m = 60 kg) stands stationary on a skateboard, holding a heavy gym bag (m = 10 kg). If she throws the bag with a velocity of 5 m/s forward, what is her velocity? Remember: The direction is determined by the action and reaction forces.

• 0.8 m/s forward

• 0 m/s

• 0.8 m/s backward

• 2 m/s backward

Multiple Choice

A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,

• her mass distribution increases and her angular speed decreases.

• her mass distribution decreases and her angular speed increases.

• her mass distribution increases and her angular speed increases.

• her mass distribution increases and her angular speed remains the same.