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Name: __________________________ Date: ___________________________ Grade & Section Letter: ____________ Momentum 1. What is the momentum of a 4 kg ball that is traveling at 5 m/s? 2. What is the momentum of a 2 kg ball that is traveling at 2 m/s? 3. How fast must a 3 kg object be moving to have a momentum of 15 kgm/s? 4. How fast must a 9 kg object be moving to have a momentum of -18 kgm/s? 5. What is the mass of an object moving at 6 m/s with a momentum of 66 kgm/s? 6. What is the mass of an object moving at -50 m/s with a momentum of -700 kgm/s? 7. Which has more momentum, a 1000 kg car moving 1 m/s or a 70 kg person sprinting at 8 m/s? Page 2 8. An official major league baseball has a mass of 0.14 kg. A pitcher throws a 40 m/s fastball which is hit by the batter straight back up the middle at a speed of 46 m/s. a. What is the momentum as the pitcher throws the 40 m/s fastball? b. What is the momentum of the batter who hits it back at 46 m/s? c. What is the change in momentum of the ball during the collision with the bat? d. If this collision occurs during a time of 0.012 seconds, what is the average force exerted by the bat on the ball? 9. A 1500 kg car traveling at 15 m/s collides with a 500 kg moose which is at rest. What is the momentum of the car? 10.A 1500 kg car traveling 5.0 m/s collides head on with a 3000 kg truck traveling 7.0 m/s in the opposite direction. a. What is the momentum of the car? b. What is the momentum of the truck? c. Which has a greater momentum and will create more force? Page 3 11. A 70 kg astronaut floating in an orbiting space station throws a 1.0 kg water bottle across the room at a speed of 8.0 m/s. What is the momentum of the water bottle? 12.Which would have more momentum a 3 kg ball traveling at 2 m/s or a 6 kg ball traveling at 3 m/s? Why? 13.Which would have more momentum, a 3 kg ball traveling at 5 m/s or a 6 kg ball traveling at 2 m/s? Why? 14.How could a 40,000 lb truck have the same momentum as a 4,000 lb car? 15.How could a 180 lb running back have more momentum than a 320 lb lineman? 16.____ 1. As the speed of a rolling ball is increasing, the increasing speed is accompanied by: a. increasing momentum. c. decreasing momentum. b. increasing inertia. d. both increasing inertia and momentum. Page 4 17.____ ____ 2. To calculate momentum: a. add the mass of an object to its c. multiply the mass of an object inertia. by its inertia b. add the mass of an object to its d. multiply the mass of an object velocity. by its velocity. 4. A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both move with a combined momentum that is _________. a. not enough information to say ____ b. less than one unit 5. If the momentum of an object changes and its mass remains constant, _________. a. there is a force acting on it. b. It is accelerating (or decelerating). c. its velocity is changing. ____ c. 1 d more than one unit . unit d. all of the above. e. none of the above. 6. While standing on a stationary skateboard, Jolene tosses a heavy ball horizontally toward one end of her skateboard. The skateboard moves. Assuming there is no friction in the system when the ball is tossed, which statement about the momentum of the heavy ball is INCORRECT? a. The ball’s momentum has increased because Jolene has tossed it. b. The directions of the ball’s momentum and Jolene’s momentum are the same. c. The ball’s momentum plus the momentum of Jolene and her skateboard equals zero. d. The ball’s momentum is equal in size to the momentum of Jolene and her skateboard. Page 5