Three children is trying to balance a uniformed seesaw. Boy A who has a mass of 20-kg is placed 3.5 meters away from the support on the one side of the seesaw.  Boy B who has a mass of 40-kg sits 2.5 meters away from the support on the opposite side of the seesaw. The seesaw is made up of a pole that is 10-kg and 10 meters long. Where should the girl whose mass is 25-kg place herself to balance the seesaw? Find the magnitude of the upward force exerted by the support on the board.

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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.