# Homework Help: Centripetal with friction

1. Sep 15, 2010

### harimakenji

1. The problem statement, all variables and given/known data
a 200 g block placed inside a cylinder (attached to the curve surface, not the base or top of the cylinder) with diameter 1m. If the coefficient of friction is 0.5, find the linear speed of the block.

2. Relevant equations
v = ωr

3. The attempt at a solution
I do not know how to take friction into consideration when doing this problem. When I draw the free body diagram, there are 3 forces acting on the object: the normal force directed radially inward, the friction directed tangentially, and weight directed downward.
So, normal force = mv2/r. After that, I do not know how to continue.

Thank you very much

******
just edit my post
I just realized that the direction of friction is wrong. It should be upward. I've solved this problem

Last edited: Sep 16, 2010
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