Pendulum measuring the restorative force HELP!! 1. The problem statement, all variables and given/known data A pendulum with length L is suspended at an angle theta. At the bottom of the pendulum, a string is attached to force meter. The string attached to the force meter is perpendicular to the pendulum string. In terms of F and theta, find an expression for mass. 2. Relevant equations Fg= -mg (Fg)r = -mgcos(theta) (Fg)t = -mgsin(theta) 3. The attempt at a solution What I get is all the tangential and radial components cancel out equally zero, which I would expect because mass doesn't matter in a pendulum. So I don't understand how I'm suppose to obtain an expression for mass.