Test - AP Physics Momentum

Which of the following has the greatest momentum?

• a scurrying cockroach

• a parked semi-truck

• more information is needed

What are the two factors that affect the momentum of an object?

• speed and velocity

• time and mass

• distance and displacement

• mass and velocity

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. The railroad car is brought to a sudden stop while the boxcar moves away from the collision. At what speed will the second boxcar move?

• 18.6 m/s

• 9.3 m/s

• 7.5 m/s

• 1.86 m/s

What would happen to the momentum of a toy car if the mass is doubled and the velocity decreases by 1/2?

• It decreases by 1/4

• It decreases by 1/2

• Stays the same

• It is doubled

A 0.15 kg mass moving at +26 m/s is slowed to a stop by a force of -390 N. How long does it take the force to stop the mass?

• 0.01 s

• 0.001 s

• 0.02 s

• 0.23 s

A car is traveling 20 m/s. It takes 4 seconds with a 7,500 N force to come to a stop. What is the mass of the car?

• 150 kg

• 1,500 kg

• 37,500 kg

• 3,750 kg

How can a tennis ball and a bowling ball have the same momentum?

• have the same speed

• have different speeds

• one is moving backwards

• they can't

Momentum is conserved in this type of collision

• elastic
• inelastic
• momentum is conserved in both types of collisions

A track athlete throws a discus that has a momentum of 42kg*m/s into a field with a velocity of 21 m/s. What is the mass of the discus?

• 1 kg

• 2 kg

• 3 kg

• 4 kg