# Static cylinder confusion

1. Dec 4, 2013

### devious b

Hi everyone,

If I have a static cylinder on an inclined rough plane at an angle alpha supported by a chord under tension, which leaves the surface of the cylinder at a tangent upwards and parallel to the plane. Does the weight component trying to pull it downwards equal the sum of the friction + tension? And does the friction oppose the translational motion, rotational, or both?

Any insights are appreciated, thx.

Last edited: Dec 4, 2013
2. Dec 4, 2013

### CWatters

Draw a force diagram. If the cylinder is not rotating what can you say about the forces/torques?

3. Dec 4, 2013

### tiny-tim

hi devious b!

there's only three forces: the weight, the reaction force, and the tension

so they must all go through the same point

(because … ?)

4. Dec 4, 2013

### devious b

My problem is the force diagram. Does the friction F act upward opposing the motion down and the torque caused by the tension?

5. Dec 4, 2013

### tiny-tim

if you follow my hint, it'll automatically give you the answer to that