Question #1: Determine a single-force equipollent system for the figure below. Give resultant force magnitude and position. The plane of the shaded triangle is the xy plane and the forces are all normal to it. zA 60 N 2 m 80 N 100 N 2 m 2 m (xy is plane of triangle; forces are normal to it.) 35

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Q: y F = 5.1 kN 4 10 + |

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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.