Problem 2: For a given force F=100 kips and a given point C, draw the 1st line and the 2nd line and indicate the two with the clear labs, show the arm or distance and determine the magnitude of the arm, and calculate the magnitude of the moment of the force about A. The distance between the point A and point B, AB=10 ft. The distance between the point B and point C , BC=10 ft and the angle between the force and line BC is 60º. 60°

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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.