Download - Easy Fun Physics

IMPULSE-MOMENTUM PROBLEMS:
1. A 1.2 kg ball is coming straight at an 80 kg soccer player at 15 m/s who kicks it in the
exact opposite direction at 24 m/s with an average force of 1400 N. How long are his foot
and the ball in contact?
2. A 1600 kg car moving eastward with a velocity of 12 m/s collides with a utility pole and
is brought to rest in 0.40 s. Find the force exerted on the car during the collision.
3. How much force is required to stop a 80 kg a man traveling at 20 m/s during a time of
a) 5 s b) 0.4 s c) 0.08 s
4. A tennis ball may leave a top player’s racket on the serve with a speed of 60 m/s. If the ball’s
mass is 0.05 kg and it is in contact with the racket for 0.02 s, what is the average force
exerted on the ball?
5. A net force of 200 Newton’s is applied to a wagon for 4 seconds. This causes the wagon
to undergo a change in momentum of?
6. A 2.4 kg ball has a momentum of 36 kg. m/s. What is the ball's speed?
7. A hockey player makes a slap shot, exerting a constant force of 35 N on the puck for 0.23
s. What is the magnitude of the impulse given to the puck?
8. A constant force of 15 N acts on a 5 kg object for 12 s. What are the changes in the
object’s momentum and velocity?
9. Your friend’s mass is 50 kg, and he has a 1.80 kg skateboard. What is the combined
momentum of your friend and his skateboard if they are going 4 m/s?
10. What is the momentum of a golf ball with a mass of 65 g moving at 53 m/s?
Answers:
1. 0.03 s
2. 48000 N
3. a) 320 N,
b) 400 N
c) 200,000 N
4. 150 N
5. 800 N.s
6. 15 m/s
7. 8.05 N. s
8. a) 180 N .s
b) 36 m/s
9. 207. 2 kg. m/s
10. 3.45 kg m/s