Conservation of Momentum Unit Review

Jamal is at the state fair playing some of the games. At one booth, he throws a 0.50 kg ball forward with a velocity of 21.0 m/s in order to hight a 0.20 kg bottle sitting on a shelf, and when he makes contact the bottle goes flying forward at 30.0 m/s. What is the velocity of the ball after it hits the bottle?

• 0 m/s

• 6 m/s

• 9 m/s

• 13 m/s

Jeanne rolls a 7.0 kg bowling ball down the alley for the league championship. One pin is still standing, and Jeanne hits it head-on with a velocity of 9.0m/s. The 2.0 kg pin acquires a forward velocity of 14.0 m/s. What is the new velocity of the bowling ball?

• 21 m/s

• 28 m/s

• 11 m/s

• 5 m/s

A space shuttle astronaut is sent to repair a defective relay in a 600.0 kg satellite that is travelling in space at 17,000 m/s. Suppose the astronaut and his Manned Maneuvering Unit (MMU) have a mass of 400 kg and travel at 17,010 m/s toward the satellite. What is the combined velocity when the astronaut grabs hold of the satellite?

• 15, 000 m/s

• 16, 050 m/s

• 17, 004 m/s

• 22, 554 m/s

Lee is rolling along on her 4.0 kg skateboard with a constant speed of 3.0 m/s when she jumps off the back and continues forward a velocity of 2.0 m/s relative to the ground. This causes the skateboard to go flying forward with a speed of 15.5 m/s relative to the ground. What is Lee's mass?

• 43 kg

• 50 kg

• 62 kg

• 71 kg

Bernie, whose mass is 70.0 kg, leaves a ski jump with a velocity of 21.0 m/s. What is Bernie's momentum as he leaves the ski jump?

• 30 kg m/s

• 140 kg m/s

• 910 kg m/s

• 1470 kg m/s

Ethel is sitting on a park bench feeding the pigeons when a child's ball rolls toward her across the grass. Ethel returns the ball to the child by hitting it with her 2.0 kg pocketbook with a speed of 20 m/s. If the impact lasts for 0.4s, with what force does Ethel hit the ball?

• 100 N

• 200 N

• 400 N

• 500 N

Which object listed below has the greatest momentum?

• 0.05 kg object rolling at .2 m/s

• A 0.15 kg object rolling at 2 m/s

• A 0.15 kg object rolling at 1 m/2

• A 0.4 kg object rolling at 2 m/s

A 10 kg toy truck moves at + 5m/s. It collides head on with a 5 kg toy car moving at -10 m/s. What is the total momentum of the system?

• 0 kg m/s

• 30 kg m/s

• 50 kg m/s

• 10 kg m/s

A 5 N force is applied to a 3kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is _____ Ns.

• -2.5

• -10

• -18

• -45

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s. What impulse does the football experience?

• 6.67 Ns

• 6.0 Ns

• 66.7 Ns