Hi all, I'm a new member here. I've encountered a lot of help from searching through this website! I've searched through several threads dealing with friction and torque on here, but still can't quite figure out this problem...(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

A plot of [tex]\tau[/tex] vs. [tex]\alpha[/tex] has a vertical intercept of 0.00176 [Nm]. If the bearings are 2 [mm] from the center of the wheel, then what is the force of friction?

2[mm] = 0.002 [m]

2. Relevant equations

[tex]\tau[/tex]=I[tex]\alpha[/tex] + [tex]\tau[/tex][tex]_{friction}[/tex]

F[tex]_{friction}[/tex] = [tex]\mu[/tex]n (Though is this cannot be directly applied since we are dealing with rotational forces, right?)

[tex]\tau[/tex] = Force x radius

3. The attempt at a solution

I know [tex]\tau[/tex][tex]_{friction}[/tex][Nm] = 0.00176 [Nm]

I am confused about the relation between frictional force and torque...

[tex]\tau_{friction}[/tex] = F[tex]_{friction}[/tex][N] * radius [m]

F[tex]_{friction}[/tex][N] = [tex]\tau_{friction}[/tex] / radius [m]

F[tex]_{friction}[/tex][N] = 0.00176 [Nm] / 0.002 [m] = 0.88 [N]

(Btw, I get "Database error

The Physics Help and Math Help - Physics Forums database has encountered a problem." after pushing Preview Post once in a while, this can't be normal right?)

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# Homework Help: Force of friction and Torque problem

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