Problem 1 The truss, given below, is subjected to the forces shown. 1) By applying equilibrium equations for the whole truss, find the reactions at the supports A and B. 2) Determine the force in each member of the truss, and state if the members are in tension or compression. Don't forget to draw FBD of each joint while solving. tan a = 10 5ft tan B 20 10 kips 10 kips 10 ft 10 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.