Concider a harbour gate 16.8m wide. If the sea faceing side had a depth of 18.11m and produces a force of 19,800,000N, while the harbour side of only 9.22m depth and exerted a force of 6,000,000N. What is the position of the resultant force line of action? If the specific gravity for the sea water is: s.g 1.04

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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.