QUESTION 5 Determine the force in Member AC of the Gambrel roof truss shown. Determine whether the member is in tension or compression. 600 lb 600 lb 600 lb D 300 lb B. 2 ft 4 in. 300 lb| 6 ft E| H Es ft 8 ft 8 ft- O 1200 Ib, Compression O 1200 lb. Tension O 1500 Ib, Compression O 1500 Ib, Tension

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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.