Problem 2. Replace the loading on the member by an equivalent resultant force (indicate the magnitude and direction of the force) and a couple moment (indicate the magnitude and direction of the moment) acting at point O. 450 lb in 80 lb 60 lb 75 lb 9 in. 60° 30 20 lb y 609 in. 30

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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.