A beam of length L and mass M is supported by, but not attached to, two posts as in the figure below. One post is at the left edge of the beam, while the other is at a distance d from the left edge. A boy of mass m starts to walk along the beam a distance of x from the right end. a. Draw a free-body diagram for the beam. b. Write an expression for the net torque about the second support. c. For L = 5.0 m, M = 40 kg, d = 3.0 m, and m = 20 kg, how close can the boy get to the right end of the beam without it falling over? (Note that the normal force from the left-end support will be zero at this moment)

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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.