A meter stick has a pivot placed ate 30 cm.  The following masses are placed at the following locations.  The meter stick is basically an inertial balance and thus doesn’t rotate.  Sum the torques in order to determine the mass of the meter stick.  500 g placed at 10 cm,  200 g placed at 40 cm and 150 g placed at 75 cm .

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.