2) The vertical bar AB has a mass of 100+ab kg with center of mass G midway between the ends. The bar is elevated from rest at 0 = 0 by means of the parallel links of negligible mass, with a constant couple M=5+b kNm applied to the lower link at C. Determine the angular acceleration a of the links as a function of 0 and find the force B in the link DB at the instant 0 = (30 + a)°. (ab is the las two digits of Student ID. For example if Student ID is 2000114526 then a=2 b=6 and ab=26. Hence Mass= 126 kg and M=11 kNm, 0 = 32°) B 1.5 m C 1.5 m M Ġ O 0.6 m 1.8 m

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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.