when a body is weighed on an ordinary balance we demand that the arm should be horizontal if the weights on two pans are equal.suppose 2 equal weights are placed on either side, the arm is kept at an angle with the horizontal and released. is the torque of the 2 weights about the middle point(point of support) 0 ? is the net torque 0 ? if so why does the arm rotate and finally become horizontal?

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\[\tau=rF \sin \theta \] so plug it in, what does that tell you?

r is the displacement vector btw

|dw:1357340856320:dw|
both the displaements appear to be the same

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