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mattyisphtty
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Homework Statement
An object of mass m sits at a distance R form the axis of rotation of a record that is being played. The record makes a complete revolution in time T and friction holds the object in its place relative to the record. The coefficient of static friction between the object and the record is uS. How much work is done by friction in one revolution?
Homework Equations
W = F*d
Force friction = uS * normal force
Not sure if this is relevant but circular motion is as follows
a = v^2 / r
v = 2 pi r / T
The Attempt at a Solution
Using Frictional force eqn i got
W = uS * mg * 2piR
Using Circular motion I got
W = (8 pi^3 r^2 m)/ t^2