The Equilibrium of Forces: The Second Law

To test the second law of equilibrium, we measure r from some arbitrarily chosen point. In this example that point is zero-point of the meter stick. Hence all the r measurements were from the end of the meterstick in Fig. 2. Thus the torque equation is: (5) Here, the counterclockwise torques are positive and the clockwise torques are negative. ................
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