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The Physics Teacher
All of the beams and the packages have the same weight w, and they are "uniform," which means the weight can be applied at the center. These systems are in equilibrium, so the net torque, the net vertical force and the net horizontal force are all zero. Symbols: w = weight, T = tension, n = normal reaction force at surface, V = vertical reaction force at hinge, H = horizontal reaction force at hinge, f = friction. RE-1 is done as an example.doi:10.1119/1.880342 fatcat:iezr7fb3tzebjjorrnvicwc7au