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- 1. Multiple Choice
a bat strikes a 0.05 kg baseball so that its velocity changes by +30 m/s in 0.1 s. With what average force was the ball struck?
+15 N
-15 N
+300 N
-300 N
+150 N
- 2. Multiple Choice
A 0.05 kg lump of clay moving horizontally at 12 m/s strikes and sticks to a stationary 0.10 kg cart that can move on a frictionless air track. Determine the speed of the cart and clay after the collision.
2 m/s
4 m/s
6 m/s
8 m/s
12 m/s
- 3. Multiple Choice
If the impulse acting on two objects is the same then
the mass of both objects is the same
the change in velocity of both objects is the same
the change in momentum of both objects is the same
the amount of contact time is the same
the force exerted on both objects is the same
- 4. Multiple Choice
OPEN ENDED QUESTION:
Trevor passes a 0.625 kg basketball to a teammate at 6.1 m/s. It collides with the referee's 0.095 kg toupee moving at 1.4 m/s. After the collision the ball continues forward at 5.1 m/s. Find the velocity of the referee's toupe.
1) M1V1+M2V2=M1V1F+M2V2F
2) (0.625 x 6.1)+ (0.095 x 1.4) = (0.625 x 5.1) + (.095V2F)
3) 3.95 = 3.19 + (.095V2F)
4) .76 = (.095V2F)
5) V2F = 8 m/s
- 5. Multiple Choice
A 65 kg student on her skateboard is at the bottom of a small hill at which time she has a momentum of 215 kg *m/s.
What is her velocity?
1) F x T = m(Vf- Vi)
2) 215 = 65 (Vf)
3) Vf= 3.3 m/s
- 6. Multiple Choice
A 10 kg rock at rest is broken into two pieces after an explosion. If a 4.0 kg part moves to the right at 21 m/s, find the velocity of the second piece.
1) M1V1 + M2V2 = M1V1F + M2V2F
2) 4 (0) + 6 (0) = 4 (21) + 6 (Vf)
3) 0= 84 + 6Vf
4) -84= 6Vf
5) Vf= -14 m/s
- 7. Multiple Choice
Two ice skaters meet in the center of the rink and come to rest. They now push off against one another. One skater with the mass of 54 kg, acquires a speed of 0.95 m/s. What is the speed of the other skater, whose mass is 61 kg?
0.47 m/s
0.48 m/s
0.84 m/s
0.88 m/s
- 8. Multiple Choice
A large fish has a mass of 25.0 kg and swims at 1.00 m/s toward and then swallows a smaller fish that is not moving. If the mass of the smaller fish is 1 kg, what is the speed of the larger fish immediately after it finishes lunch.
1.00 m/s
0.96 m/s
1.04 m/s
26 kg*m/s
- 9. Multiple Choice
Bean bag rounds used by police are nonlethal projectiles fired from shotguns. If a 40.0-g round strikes at 70.0 m/s and delivers all its momentum over a time of 0.15 s, what is the average force of impact?
18.7 x 103 kg*m/s
18.7 kg*m/s
18.7 kg*m/s2
18.7 x 103 kg*m/s2
- 10. Multiple Choice
A 3.00 kg object is moving toward the right at 6.00 m/s. A 5.00 kg object moves to the left at 4.00 m/s. After the two objects collide the 3.00 kg object moves toward the left at 2.00 m/s. What is the final velocity of the 5.00 kg object?
-0.8 m/s
2 m/s
0.8 m/s
-2 m/s
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