300 mm FN kN SN kN-mm 250 mm MN kN SN kN FN kN 200 mm 100 mm FN kN 25° 150 mm Compute the following in vector form A. The resultant forces [resultant] B. Moment at MN kN force [momenta] ALVIN (FN) = 1+12+ 23 +9 + 14 = 59 NAVALTA (MN) = 14 + 1+ 23 +1+ 12 + 21 +1 = 72 DELIRO (SN) = 4+5+12+9+19 + 16 = 65

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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.