- #1

Cri85

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## Homework Statement

[/B]

A motor accelerates more and more a wheel without friction. It is supposed the belt gives forces F

_{1}and F

_{2}at only one point.

http://imageshack.com/a/img674/1437/Uh0XIp.png

## Homework Equations

None

## The Attempt at a Solution

I would like to know if I drawn all forces:

http://imageshack.com/a/img674/2809/o4uI79.png 1) Is it correct ?

2) The motor is turning clockwise at ω, so the wheel is turning at ωR

_{1}/R

_{2}?

3) The motor needs to give F

_{1}R

_{1}ωt, so the wheel receives F

_{2}R

_{2}ωR

_{1}/R

_{2}=FR

_{1}ωt because |F1|=|F2|, correct ?

4) The sum of forces on the belt is F

_{3}-F

_{4}, if the motor accelerates this could say the belt is accelerating too, then F

_{3}must be higher than F

_{4}, so F

_{1}must be higher than F

_{2}(the absolute value not the vector) ? I'm not sure, if F

_{2}is lower the torque on the wheel is lower too, so the last calculation is false ?

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