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Physics – Momentum – Unit Review
NAME: ___________________
Pd: _____
1) Define impulse
2) During what type of collision is Energy not conserved?
3) What type of collision applies more force, an inelastic or an elastic (bouncing)? Why?
4) Give 2 examples of a Perfectly elastic collision, and two examples of inelastic collisions.
5) If the time of impact during a collision increases, what happens to the force?
6) What is the momentum of a stationary object?
7) A truck loaded with sand is on a straight path. A) What happens to the momentum of the
truck if the truck’s velocity is increasing? B) What happens to the momentum of the
truck if sand leaks at a constant rate through a hole in the truck bed while the truck
maintains a constant velocity?
8) For safety reasons, it is recommended that a heavy load is not regularly carried in the
back of a pickup truck. Explain why in terms of momentum.
9) How do car bumpers that collapse on impact help protect the driver?
10) Who is Pelton, what did he do?
11) A football punter accelerates a .55 kg football from rest to a speed of 8 m/s in .25 s. What
force does the punter exert on the ball? (18 N)
12)What is the momentum of a proton with mass 1.67 x10-27 kg moving with a velocity of 5x106
m/s upward? (8.35x10-21 kg m/s).
Physics – Momentum – Unit Review
NAME: ___________________
Pd: _____
13) If a .147 kg baseball has a momentum of 6.17 kg m/s as it is thrown from home to second
base, what is its velocity? (42 m/s toward second base)
14) A .025 kg golf ball moving at 18 m/s crashes through a windows of a house in 5x1—4 s.
After the crash, the ball continues the same directions with a speed of 10 m/s. What is the force
exerted on the ball by the window? (400 N).
15) An ice skater (ignore friction) is moving to the right with a velocity of 2.5 m/s. the ice skater
throws a .15 kg snowball to the right with a velocity of 32 m/s. What is the velocity of the ice
skater after throwing the snowball? (2.43 m/s to the right).
16) A 95 kg fullback moving south with a speed of 5 m/s has a perfectly inelastic collision with a
90 kg opponent running north a 3 m/s. How much KE was lost during the collision? (1400 J)
17) A .015 kg marble moving to the right at .225 m/s makes an elastic head on collision with a
.03 kg shooter marble moving to the left at .18 m/s. After the collision, the smaller marble
moves to the left at .315 m/s. What is the velocity of the .03 kg marble after the collision. Since
this is an elastic collision verify that KE is conserved. (.09 m/s to the right, KEi = .00087 J =
18.) Object A has a mass of 5 kg, and is moving at a velocity of 3 m/s at 30o to the horizontal.
Object B has a mass of 3 kg, and is moving at a velocity of 5 m/s at 200o to the horizontal.
The two objects collide. Object B bounces at a velocity of 2 m/s at 70o to the horizontal.
Determine the velocity of object A after the collision.