Momentum and Impulse

1. Calculate the momentum of a 1500 kg car traveling north on the highway at 17 m/s.

2. A 0.12 kg robin flies through the air with 1.7 kg•m/s of momentum. What is the speed of the

robin?

Photo by Richard Hurd / CC-BY 2.0

3. A force of 55 N is applied to a 7.3 kg bowling ball for 0.81 seconds. If the bowling ball was initially at rest, what is the momentum of the bowling ball after the force was applied? How fast is the bowling ball moving?

Photo by Xiaphias / CC-BY-SA 3.0

4. A pitcher applies an average force of 6.2 N in the forward direction on a baseball for 0.65 seconds. The baseball’s mass is 0.145 kg. and initial velocity is zero. What momentum does the baseball have as it is released by the pitcher? How fast is the baseball going after the impulse?

5. The catcher catches the baseball in the problem above. It takes 0.15 seconds to stop the ball. How much average force must the catcher apply during that time interval? (Ignore air resistance.)

6. A hockey puck slides across the ice at an initial velocity of 1.3 m/s. The mass of the hockey puck is 0.17 kg. Friction between the ice and the puck is 0.090 N. Draw a free body diagram of the puck. Calculate the time it would take for the puck to come to a complete stop.

Photo by Janothird / CC-BY-SA 3.0

7. A pool cue ball moving at 2.1 m/s east collides in a straight line with the eight ball at rest. Find the velocity of the eight ball after the collision if momentum is conserved and

A. the cue ball stops.

B. the cue ball continues on in the same direction at 0.10 m/s.

C. the cue ball continues on in the same direction at 0.70 m/s.