# Rod on a pivot: Linear acceleration and reaction forces

1. Jul 17, 2012

### StrawHat

1. The problem statement, all variables and given/known data

2. Relevant equations
r * $\alpha$ = atan
r * $\omega^2$ = arad

3. The attempt at a solution
atan = (L/2)(3g/2L) = 3g/4

2. Jul 17, 2012

### Staff: Mentor

How did you get this?
Looks OK. (But don't forget the proper signs of the components.)

3. Jul 17, 2012

### StrawHat

I got arad = 3g/2 by multiplying r by ω2.

EDIT: It was actually -3g/2.

Going onto the reaction forces, I thought it was just R = ma, but apparently that's not the case...

Re-EDIT: Got it. I just needed to add the negative signs.

Last edited: Jul 17, 2012