Name______Date______Per______
Impulse & Collisions
SHOW YOUR WORK
1. A 3-kilogram ball is accelerated from rest to a speed of 10 m/sec.
a. What is the ball’s change in momentum?
b. What is the impulse?
c. If a constant force of 40 newtons is applied to change the momentum in this situation, for
how long doesthe force act?
2. A 2,000-kilogram car uses a braking force of 12,000 newtons to stop in 5 seconds.
a. What impulse acts on the car?
b. What is the change in momentum of the car?
c. What is the initial speed of the car?
3. A 60-kilogram high jumper lands on a mat after her jump. The mat brings her to a stop after
1 second. Shewas traveling at 5.0 m/sec when she landed on the mat. Note: The speed of the
jumper at the top of her jump,before she started to fall toward the mat, was 0 m/sec.
a. What is the change in momentum for the jumper?
b. What is the force felt by the jumper upon impact with the mat?
4. A 0.5-kilogram soccer ball is kicked with a force of 50 newtons for 0.2 seconds. The ball was at
rest beforethe kick. What is the speed of the soccer ball after the kick?
5. A baseball player hits a 0.155-kilogram fastball traveling at 44.0 m/sec into center field at a
speed of 50.0m/sec. If the impact lasts for 0.00450 second, with what force does he hit
the baseball?
6. Tow Sawyer launches his 180-kilogram raft on the Mississippi River by pushing on it with a
force of75 newtons. How long must Tom push on the raft to accelerate it to a speed
of 2.0 m/sec?
7. A 4-kilogram ball moving at 8 m/sec to the right collides with a 1-kilogram ball at rest. After
the collision,the 4-kilogram ball moves at 4.8 m/sec to the right. What is the velocity of
the 1-kilogram ball?
8. A 0.0010-kg pellet is fired at a speed of 50.0m/s at a motionless 0.35-kg piece of balsa wood.
When thepellet hits the wood, it sticks in the wood and they slide off together. With what
speed do they slide?
9. Snowboarding cautiously down a steep slope at a speed of 7.0 m/sec, Sarah, whose mass
is 50. kilograms, isafraid she won't have enough speed to travel up a slight uphill grade
ahead of her. She extends her hand asher friend Trevor, having a mass of 100. Kilograms
is about to pass her traveling at 16 m/sec. If Trevor grabsher hand, calculate the speed at
which the friends will be sliding.
10. Tex, an 85.0 kilogram rodeo bull rider is thrown from the bull after a short ride.
The 520. kilogram bullchases after Tex at 13.0 m/sec. While running away at
3.00 m/sec, Tex jumps onto the back of the bull toavoid being trampled. How fast
does the bull run with Tex aboard?