A platform is attached to a pole by two bolts, as shown. A force F of magnitude 400N is applied at an angle of 0-30° at point A on the platform. The height h of the platform is 2m and the length from the center of the pole to the end of the platform m is 1m. The bolts are located at a distance d from the centerline equal to .1 m. The point D is located at height k above the ground equal to .3m. a) Replace the force F by an equivalent force-couple system acting at point D. b) Redistribute this force and couple by replacing it with two forces acting in the same direction as F, one at each bolt (points B and C). Determine the magnitude of these forces supported by the two bolts. m Ө F d d h

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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.