Q.3) The simply support beam has a roller support at A and pin support at E. a) Write the expression for the shear force and bending moment as a function of x measured from the left edge of the beam for the region between points E and F. b) Draw the shear force and bending moment diagrams for the entire length of the beam. Label all critical points. 3 ft 600 lb B 60 lb/ft C 1400 lb-ft 3 ft 300 lb D + 4 ft → 4 ft 6 ft F 200 lb 3 ft G

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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.