Q.3) The structure below is subjected to a set of forces as shown. a. Replace the given system by an equivalent resultant force and couple moment acting at point O. Draw the equivalent system. b. Reduce the equivalent system from part (a) into a simplest resultant (single force) and find the x- and y-intercepts for its line of action. Draw the simplest resultant and include a dashed line showing its line of action. F₂ = 220 lb F3 = 150 lb 60° -1 ft- F4 = 125 lb y F₁ = 90 lb 2.5 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.