# Meterstick against wall

## Homework Statement

A 0.13 kg meter stick is held perpendicular to a wall by a 2.7 m string going from the wall to the far end of the stick.
(a) Find the tension in the string.
(b) If a shorter string is used, will its tension be greater than, less than, or the same as that found in part (a)?
(c) Find the tension in a 2.0 m string.

Torque=Nr?

## The Attempt at a Solution

I discovered the angle to be 68.38 degrees, and I thought that, since the y-component of the force cancels out mg, T=mg/sin(theta). Why is it wrong?

## Answers and Replies

Doc Al
Mentor
The string tension is not the only force (besides the weight) acting on the stick.

I know that the wall exerts a horizontal force, but that doesn't matter in the Fy equation.

Doc Al
Mentor
But the vertical force it exerts does.

wait... how does it exert a vertical force? Is there a friction force?

Doc Al
Mentor
wait... how does it exert a vertical force? Is there a friction force?
There better be. But you need not worry about the wall force to solve this problem.