Momentum and Impulse
Name:____________________________________________ Prd:_______
1) A 200 g baseball travels at 90 mph (40 m/s) [east] toward the catcher who catches it.
a) What is its initial momentum?
b) What is its final momentum?
c) If the glove stops the ball in 0.1 seconds, what is the force exerted by the glove on the ball?
2) A car weighs 7840 N,
a) What is its mass?
b) The car's velocity is 25 m/sec eastward. What is its momentum?
c) The car was accelerated from rest to 25 m/sec by a force of 1000 N. How long did the force act to give it this velocity?
3) A car of mass 1100 kg moves at 22 m/sec. What braking force is needed to bring the car to a halt in 20 sec?
4) A 0.40 kg ball travels toward the wall at a speed of 10 m/s. If it bounces back at 5 m/s, what is its change of momentum?
5) A net force of 2000 N acts on a rocket of mass 1000 kg. How long does it take this force to increase the rocket's velocity
from 0 m/sec to 200 m/sec up?
6) A bat exerts a force of 60 N [R] in a time interval of 0.18 seconds on a baseball of mass 0.200 kg. If the baseball has an
initial velocity of 12 m/s [L] when struck by the bat, find the final velocity of the baseball.
7) A 200 g ball strikes a wall at 6 m/s [R] and bounces straight back at 5 m/s [L], as shown. Find the
a) change in momentum of the ball
b) impulse on the ball
c) force that the wall exerts on the ball if it is in contact with the wall for only 0.05 seconds
d) kinetic energy lost during the collision
8) A 3 kg object has a kinetic energy of 1200 J. What is the magnitude of its momentum?
9) A 2700 kg car is moving at 8 m/s [W]. The driver slams on the brakes and stops in 3 seconds. Find the:
a) original momentum of the car
b) impulse on the car
c) change in momentum of the car
d) force exerted by the brakes