Chapter 6 Momentum 1) A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is A) zero. B) doubled. C) quadrupled. D) unchanged. 2) A rifle recoils from firing a bullet. The speed of the rifle's recoil is small because the A) rifle has much more mass than the bullet. B) force against the rifle is smaller than against the bullet. C) momentum is mainly concentrated in the bullet. D) momentum of the rifle is smaller. 3) Compared to falling on a wooden floor, a wine glass may not break when it falls to a carpeted floor because of the A) lesser impulse in stopping. B) longer time to stop. FΔt = Δmv C) both of these. D) neither of these. 4) A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is A) the same. B) greater. C) smaller. 5) A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball that is initially at rest. The bowling ball and putty are then in motion with a speed of
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