(3) Beam ABC has a rectangular cross section of 300 mm by 100 mm. Attached rod BD has a diameter of 20 mm. Determine the vertical displacement of point C due to the loading. Consider only the effect of bending in ABC and only axial force in DB. E = 200 GPa. Use the method of virtual work. A 100 mm 300 mm 3 m B 3 m 20 KN C 4 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.