Date Period 8. A bowling ball rolls across flat ground without slipping and slow

Question

Date Period 8. A bowling ball rolls across flat ground without slipping and slows to a stop. What force caused the ball to come to rest? a. the force of gravity b. friction c, normal force d. centripetal force 9. Auna C. Saw is on a seesaw. If Auna sits a on a seesaw a distance d from the fulcrum, how far from the other side of the fulcrum should her younger sister, Urauna C. Saw, who weighs half as much as Auna, sit to balance the seesaw? a. 4d b. 2d 10. Jo Mahma is riding in a toy bus of mass 300 kg. The wheels on the bus go round and round at 22.7 rad/sz. If the wheels begin with an angular speed of 10.6 rad/s, how long does it take them to make 12 full rotations a. 0.66 sec b. 2.15 sec c. 25.6 sec d. 59.5 sec

Explanation / Answer

8) friction. because the friction opposes relative motion

9)she should sit at 2d to blance the moment abount the center.

10)12 roation =12*2pi radians

so

24pi=10.6t+1/2*22.7t^2

this gives t = 2.15 seconds

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