Download Wksht Momentum Review

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Date: _______________ Period: ________
Momentum Review
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1. A 1400 kilogram car crashes into a tree. It was going 20.0 meters per second and it was
brought to rest in 0.4 seconds. Find the average force exerted on the car during the collision.
2. A wagon has a momentum of 1200 kg m/s. What would be the wagon's new momentum if ...
A) its velocity were doubled.
B) its velocity were tripled.
C) its mass were doubled (by adding more passengers and a greater load)
D) both its velocity were doubled and its mass were doubled.
3. A hockey player applies an average force of 80.0 N to a 0.25 kg hockey puck for a time of
0.10 seconds. Determine the impulse experienced by the hockey puck.
4. If a 5-kg object experiences a 10-N force for a duration of 0.1-second, then what is the
momentum change of the object?
5. A bicycle (with rider, 105 kg) traveling at 7 m/s [W] heads toward a pedestrian (70 kg)
traveling at 3.5 m/s. Calculate the total momentum of the system (bicycle + rider and
pedestrian) if
A) The pedestrian is traveling west.
B) The pedestrian is traveling east.
6. Using the sketch below, determine (assuming each ball has a mass of 30 g)
A) The change in momentum for A and B
B) The impulse for A and B
7. If a 5-kg bowling ball is projected upward with a velocity of 2.0 m/s, then what is the recoil
velocity of the Earth (mass = 6.0 x 1024 kg).
06/29/17
8. What is the velocity after 10 seconds, if a 2 kg box, initially going 1 m/s, is pushed with a
force as described in the graph below?
1.2
1
Force (N)
0.8
0.6
0.4
0.2
0
0
2
4
6
8
10
12
14
16
Time (s)
9. A 120 kg lineman moving west at 2 m/s tackles an 80 kg football fullback moving east at 8
m/s. The lineman collides with the fullback and the travel “together”. How fast will the pair
be moving?
10. Would you care to fire a rifle that has a bullet that is ten times as massive as the rifle?
Explain in terms of this chapter.
11. Why is an airbag useful in a collision? Explain in terms of this chapter.
12. A 0.105 kg hockey puck moving at 48 m/s is caught by a 75 kg goalie at rest. With what
velocity does a the goalie slide on the ice after catching the puck?
13. A 0.5 kg ball traveling at 6 m/s [E] collides head on with a 1 kg ball moving in the opposite
direction at 12 m/s. The 0.5 kg ball rebounds at a speed of 14 m/s after the collision.
A) What is the velocity of the 1 kg ball after the collision?
B) Is the collision elastic or inelastic?
14. A steel ball of mass 0.50 kg, moving with a velocity of 2.0 m/s [W], strikes a second ball of
mass 0.30 kg, initially at rest. The collision is a glancing one, causing the first ball to be
deflected by an angle of 30° toward the north, with a speed of 1.50 m/s. What is the final
velocity of the second ball?
Answers: 1) 70 000N [backward], 2) a)2400 kg m/s, b) 3600 kg m/s, c) 2400 kg m/s, d) 4800 kg m/s,
3) 8.0 N s, 4) 1 N s, or 1 kg m/s, 5) a) 980 kg m/s [W], b) 490 kg m/s [W], 6) a) 0.45 kg m/s [L], 1.74
kg m/s [L], b) same as a, 7) 1.67x10-24 m/s [downward], 8) 3.4 m/s, 9) 2 m/s [E], 10) see solutions,
11) see solutions, 12) 0.0671 m/s [backward], 13) a) 2 m/s [W], b) inelastic (KEi=81 J, KEf=51J), 14)
1.71 m/s [46.9°S of W]