PHYS 6A Lecture Notes - Lecture 15: Table Tennis, Bowling Ball, Crash Test
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The following objects all have the same magnitude of momentum. Ans: pyramid of mass 0. 50kg moving at 10m/s. The object going faster always has a much higher ke. Change in momentum depends on how large the force is and how long you exert the force. Suppose a ping-pong ball and a bowling ball are rolling toward you. Both have the same momentum and you exert the same force to stop each. Same momentum (same change in momentum) same time. You are testing a new car using crash test dummies. Consider two ways to slow down the car from 90 km/h (56 mi/h) to a complete stop. You let the car slam into a wall, bringing it to a sudden stop. You let the car plow into a giant tub of gelatin so that it comes to a gradual halt. Ans: the impulse is the same in both cases. Again, change in momentum is the same.
