When two billiard balls collide, the collision force as a function of time follows the graph shown below. What is the magnitude of the impulse during the collision? F(N) 500 250 t(ms) 0.0 2.0 4.0 6.0 a. 0.50 N-s b. 0.30 N-s C. 0.70 N-s d. 1.1 N-s

I. Conceptual Physics. Justify your answer. 1. A 10-gram rubber ball and a 10-gram clay ball are thrown at a wall with equal initial speeds. The rubber ball bounces, the clay ball sticks. Which ball exerts a larger impulse on the wall? Justify your answer.

B6

A 7400 kg truck traveling along a straight road at 14 m/s comes to a stop and remains stationary for several minutes. It then accelerates backward in reverse until it reaches 5.0 m/s in the opposite direction. What is the magnitude of the change in momentum of the truck for this entire process? A. 100,000 kg. m/s B. 140,000 kg. m/s C. 67,000 kgm/s D. 37,000 kgm/s O C O B OD O A

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

3. A 4 Kg of putty moving to the right has a head-on inelastic collision with 2 Kg putty moving to the left. If the combined blob does not move after the collision, what can we say about the speeds of the two blobs? a. V2 = V1 b. V2 = V1/2 c. V2 = 2*V1

Ball B Ball A а. 1.75 m/s b. 1.9 m/s 3.5 m/s 3.35 m/s с. 3.06 m/s 2.19 m/s d. 3.00 m/s 2.25 m/s e. 2.95 m/s 2.29 m/s Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If the speed of Bali A is initially 3.50 m/s, and that of Ball B is 1.75 m/s, theft speeds after the collision will be * a

1. Calculate the magnitude of the impulse during the collision. 2. Calculate the magnitude and direction of the velocity of the 4.0 kg cart after the collision. 3. Calculate the mass m of the second cart

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).