Situation 1 The three members of the frame each have a weight per unit length of 4 Ib/ft. Neglect the size of the pins at the joints and the thickness of the members. 1. Locate the position of the center of gravity from the reference x-axis. 2. Locate the position of the center of gravity from the reference y-axis. 3. Determine the moment reaction at the fixed support A. 3 ft D 60 lb 3 ft 4. 3 ft B 4 ft - 3 ft3 ft

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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.