Consider the beam shown below. The structure is subjected to two concentrated loads. If all three supports settle the following amounts: A = 4.0 in., B = 2.0 in., and C = 3.5 in., determine the support reactions and draw the bending moment and shear force diagrams. | 60k 90 k Bo - 10n 10 ft – 10 - 10 ft 10 ft Note: E = 4,000 ksi, I = 1200 in"; select the reaction at Support B to be the redundant.

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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.