Q.1) A bent beam is acted on by two forces and one couple moment. The 45 lb force is perpendicular to BC and the 30 lb force makes a 60° angle with the vertical. A 100 lb-ft couple moment is applied at point A. counterclockwise) of the resultant moment a) about point A b) about point B c) about point C Determine the magnitude and direction (clockwise or 45 lb 10 ft 35° 12 ft 30 lb 60° 100 lb-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.