# Homework Help: Friction/heat calculation

1. Jan 20, 2014

### Ziv7

1. The problem statement, all variables and given/known data
I need to find out how much heat is generated by a brake.
I know heat generated = friction
The parameters that will affect it friction are
Normal load (I can choose depending on outcome)
Coefficient of friction (assumed 0.8 between carbon fiber and steel plate)
Area of contact (I can choose depending on outcome)

2. Relevant equations

I couldn't find relevant equations, which is why i need help in connecting the parameters

Friction = normal load x coefficient of friction ?

2. Jan 20, 2014

### .Scott

Frictional force = normal load X coefficient of friction
Work = force X distance

Area of contact is not relevant

BTW: I'm guessing that it you took separated your work from the "problem statement" (per the homework form), you would have gotten more responses.

3. Jan 21, 2014

### Ziv7

Thanks, so is the distance angular velocity x time?
Also, surely the force has to be subject to the coefficient of friction?..

4. Jan 21, 2014

### .Scott

The coefficient is part of the computation. You need it to compute the force.

Assuming a drum brake, distance is radius X angular velocity X time.