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| 1. |
The body in shown figure is pivoted at O, and two forces act on its as shown. Find an expression for the net torque on the body about the pivot. |
| Answer» Solution : Take a troque that TENDS to CAUSE a counter CLOCKWISE rotation to be POSITIVE and a torque that tends to cause a clockwise rotation to be negative. Thus a positive torque of magnitude `r_1 F_1sin theta_1` is associated with`vecF_1`and a negative torque of magnitude `r_2 F_2 sin theta_2`is associated with `vecF_2`. Both of these are about O. The net torque about O is`TAU = r_1 F_2 sin theta_2` | |