AP Momentum Review

A train-car of mass M moves at a velocity v at another stationary train-car with mass m. They collide and stick together. What is the new velocity of the system?

• MV/(M + m)
• MV/2
• MV/(M - m)
• (M + m)V/(M - m)

If a 6kg object is traveling to the right at 8 m/s but then changes direction and has a change in momentum of -72 kg m/s what would the new velocity of the object be?

• - 4 m/s
• - 12 m/s
• 4 m/s
• 12 m/s

Mr. Johnson, 90kg, and Bobo, 20kg, are jingling all the way on a one horse open sleigh of 10kg. They are traveling at 17m/s. Bobo then pushes Mr. Johnson off of the sled and he has an initial speed of 12m/s in the same direction. How fast is Bobo now traveling on the sled?

• 32 m/s
• 17 m/s
• 12 m/s
• 68 m/s

A car of mass 200kg starts from rest and is pushed to the left for 10 seconds to get to the final velocity of 25 m/s, what is the force acting on the car?

• -500 N

• -300 N

• 500 N

• 300 N

If an object with a mass of 7kg is traveling to the right at 6 m/s and object 2 with a mass of 9kg is traveling to the left at - 5 m/s what would be the total momentum of the system if they had an inelastic collision?

• - 3 kg m/s
• 87 kg m/s
• - 87 kg m/s
• 3 kg m/s

A bumper car weighs 115 kg, Chris (85 kg) is going 6m/s due west and hits Steve (75 kg) going 5m/s due east. If Steve is going 5.5m/s due west after the collision how fast is Chris going?

• - 3.975 m/s
• 3.975 m/s
• -6.475 m/s
• 3.45 m/s

If an object's mass is increased by a factor of 2 and momentum is conserved, how does the object's velocity change?

• reduced by a factor of 2
• increased by a factor of 2
• no change
• Cannot be determined

Captain America's shield hits some useless villian in the face and it bounces back. Who experiences the greater impulse, his shield or the useless villian?

• Both are the same
• Shield
• Uesless VIllian
• Cannot be determined

Which would have a larger momentum, Car1 of mass m traveling at speed v, or Car2 of mass 1/2m traveling at speed 2v?

• Equal Momentums
• Car1, because it has more mass
• Car2, because it has a larger velocity
• Car2, because mass doesn't matter in momentum

A baseball player catches a ball by moving his hand back in the direction of the ball's motion. Doing this results in a lower force acting on the player's hand. Why?

• Increased time of impact
• Decreased time of impact
• Impact velocity is lessend
• the change in momentum is decreased