AP Physics Unit 5 & 6 Momentum and Simple Harmonic Motion

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

Gerald the archery student shoots an arrow at a stationary target. The arrow has mass m, and the target has mass 2m. After the collision, they both travel together at velocity v. What was the initial velocity of the arrow?

• 3v
• 2mv
• 3mv
• v/2

A force acted upon an object for 3 s as shown in the graph below.
What is the magnitude of the impulse on the object?

• 3
• 4.5
• 6
• 9

A 2 kg object initially moving with a constant velocity is subjected to a force of magnitude F in the direction of motion. A graph of F as a function of time t is shown. What is the increase, if any, in the velocity of the object during the time the force is applied?

• 0 m/s 
• 3.0 m/s 
• 4.0 m/s 
• 6.0 m/s