Constant Torque Find magnitude of friction force

AI Thread Summary
To find the magnitude of the friction force acting on a grinding wheel with a radius of 0.330 m and a constant torque of 72.1 N*m, the relationship between torque, radius, and force can be utilized. The equation for torque is given by τ = r * F, where τ is torque, r is the radius, and F is the friction force. Rearranging this equation allows for the calculation of the friction force as F = τ / r. Substituting the known values, F can be determined without needing the mass of the wheel. This approach simplifies the problem significantly.
sarahjt1
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Homework Statement


A grinding wheel of radius 0.330m rotating on a frictionless axle is brought to rest by applying a constant friction force tangential to its rim. The constant torque produced by this force is 72.1 N*m. Find the magnitude of the friction force.

I'm honestly lost at even starting this problem but below are some equations that I THINK are relevant but I don't really know.

Homework Equations



torque=I alpha, where I = 1/2MR^2.

This is where I get confused because we are not given a mass....


The Attempt at a Solution

 
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Nevermind... silly me. Much simpler than I thought.
 

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