Momentum and collision

Momentum can be calculated by multiplying the velocity of the object and its_____.

• Acceleration

• Mass

• Length

• Time

The momentum of a 225 g softball moving at 35 m/s is ______.

• 2.1 kg m/s

• 5.0 m/s

• 7.9 kg m/s

• 3.5 N

Which has more momentum, a 3.0 kg mass moving at 9.0 m/s or a 5.0 kg mass moving at 5.0 m/s?

• A 3.0 kg mass moving at 9.0 m/s

• A 5.0 kg mass moving at 5.0 m/s

• They have the same velocity

• None of them

Two cars collide, lock bumpers, and move together after the collision. What kind of collision is this?

• Elastic

• Inelastic

• Perfectly Elastic

• Perfectly Inelastic

In what kind of collision is kinetic energy always conserved?

• Elastic

• Inelastic

• Perfectly Elastic

• Perfectly Inelastic

Which has a greater momentum, a 1000 kg truck at rest or a 100 kg bicycle in motion?

• Truck

• Bicycle

• Same

• Neither has momentum

Two playground balls collide in an inelastic collision. Which of the following is true?

• Both momentum and kinetic energy are conserved.

• Kinetic energy is conserved, but momentum is not conserved.

• Both momentum and kinetic energy are conserved.

• Neither momentum nor kinetic energy is conserved.

Which of the following statements is correct?

• The greater the momentum of a moving body the more difficult it is to stop.

• The greater the momentum of a moving body, the easier it is to stop.

• The lesser momentum of a moving body, the more difficult it is to stop.

• The lesser momentum of a moving body the greater effort it takes to stop.

How does the momentum of an object change if the object’s velocity doubles?

• The momentum doubles

• The momentum increases by a factor of four.

• The momentum decreases by a factor of ½

• The momentum decreases by a factor of ¼

A billiard ball hits another ball that is at rest. The second ball moves as a result. Which of the following is true?

• The momentum of the first ball doesn’t change.

• The momentum of the second ball doesn’t change.

• The momentum lost by the first ball is gained by the second ball.

• The total momentum of the system increases.