- #1

AdamP

A wheel is being pulled by a force F directly

__upwards__, which causes it to roll without slipping (due to static friction), on a horizontal surface. The upward force F is applied at the

__most right tip or edge__of the disc.

Find the

**acceleration, a**, and the

**static frictional force, f.**

I'm not sure how to set up the torque or force equations etc...

So, if F is directly upward, and on the edge, is it like F*cos90=0, so

0-f=ma?

and second equation,

F*(2R)=(moment of inertia about point of contact of disc and surface) * (angular speed)

where

moment of inertia about point of contact = (moment of inertia about center of mass, given) + m*R^2

and

angular speed=a/R (because no slip?)

so in this case, solving the F*2R= --- etc. equation, we get

__a=3F/2m__

and using 0-f=ma,

__f=-3F/2__

Does this sound right at all or what should I do? Any suggestion is much appreciated!