Physics 432 Momentum MOMENTUM PRACTICE PROBLEMS 1. a ...

Physics 432MomentumMOMENTUM PRACTICEPROBLEMS1. a) What is the momentum ofan 8-kg bowling ball rollingat 2 m/s?b) If the bowling ball rolls intoa pillow and stops in 0.5 s,calculate the average forceit exerts on the pillow.2. A 1000 kg car moving at20 m/s slams into a buildingand comes to a halt. Whatimpulse acts on the car?3. A car with a mass of 1500 kgmoves at 30 m/s. Whatbraking force is needed tobring the car to a halt in 10 s?4. Consider a 6-kg fish thatswims toward and swallows a3-kg fish that is swimmingtoward the large fish at 2 m/s.If the larger fish swims at1 m/s, what is its velocityimmediately after lunch?(HINT: Remember the fish areswimming in oppositedirections. Think of one aspositive and the other asnegative.)5. In terms of impulse andmomentum, why are air bagsin automobiles a good idea?

-2-6. A bug and the windshield ofa fast-moving car collide.Indicate whether each of thefollowing statements is trueor false.a) The forces of impact on thebug and on the car are thesame size.b) The impulses on the bugand on the car are thesame size.c) The change in speed ofthe bug and the car is thesame.d) The changes in momentumof the bug and of the carare the same size.