heavy load Mg = 66 kN hangs at point E of the single cantilever truss shown in the picture. Neglect the weight of the trusses, which is small compared to the load. (a) Use a torque equation for the truss as a whole to deter- mine the tension FT in the support cable. Determine the magnitude and direction of force vector FA on the truss at pin A.

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.