1. A 1.0-kg ball travelling at 4.0 m/s strikes a wall and bounces straight back at 2.0m/s. a. What is the change of momentum of the ball? b. What is the impulse applied to the ball? c. What is the impulse applied to the wall?

B6

A golf ball has a mass of 46 g. Just after being struck, the ball reaches a speed of 61 m/s. i. What is the momentum of the ball just after impact? ii. The collision between the club and the ball lasts (0.0005 s). What is the average force exerted by the club head on the ball? iii. The club head of a driver has a mass of 200 g. If the club speed is 42 m/s just before impact, what is the club speed just after impact, due to the reaction force exerted by the ball on the club?

1. A0.12-kg ball is moving at 6 m's when it is hit by a bat, causing it to reverse direction and have a speed of 14 m/s. What is the magnitude of the change in the momentum of the ball? a. 0.39 kg m's b. 0.42 kg-m's c. 1.3 kg-m's d. 2.4 kg-m's 2. Alex throws a 0.15-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 3.5 m's. What is the magnitude of the change in the ball's momentum? a. 0.09 kg-m/s b. 1.5 kg-m/s c. 4.3 kg-m/s d. 126 kg -m/s

4. A 0.060 kg ball hits a wall with an initial speed of 30 m/s in the -x direction and bounces off with the same speed in the +x direction. The graph shows the force of the wall on the ball during the interaction. a) Draw the ball and the wall just before and just after the collision. b) What is the impulse of the force of the wall on the ball? b) What is the maximum value of the contact force Fmax between the wall and the ball? Fmax t (ms) 6 4.

6. A 0.25 kg ball bounces off a vertical wall as shown. The speed of the ball just before hitting the wall is 8 m/s and just afterwards is 6 m/s. The collision takes 0.1 sec. a. What is the impulse delivered to the ball? Write in component vector form. y 30° 30 What is the average force that the wall exerts on the ball during the collision? Remember the impulse-momentum relation refers to the net force; you will have to take gravity into account when you do your analysis. c. What is the average force that the ball exerts on the wall during the collision? d. Repeat your calculation for the average y force on the ball using Newton's 2nd law and the free body diagram method. Make sure your answer agrees with your answer for (b).