# Homework Help: Bowling ball Torque problem

1. Jun 19, 2010

### cuman12

A bowling ball rolls without slipping up a ramp that slopes upward at an angle beta to the horizontal. Treat the ball as a uniform, solid sphere, ignoring the finger holes.

What is the acceleration of the center of mass of the ball?
Express your answer in terms of the variable beta and appropriate constants.

I got this part:
gsinB/(7/5)

What minimum coefficient of static friction is needed to prevent slipping?
Express your answer in terms of the variable beta and appropriate constants.

Any suggestions for this part?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Jun 19, 2010

### hikaru1221

If you got the acceleration of C (center of mass), you should be able to calculate the normal force N and the frictional force F, right? We have $$\mu _{static}\geq F/N$$, and you get the minimum static friction coefficient.