At a constant speed with the wind, the sailboat is driven by a 1170-lb force against its mainsail and a 370-lb force against its staysail as shown. The total resistance due to fluid friction through the water is the force R. 1. Find the force R. (in lb) 2. Find the magnitude M of the moment due to the lateral forces. (in Ib-ft) Wind 370 lbt 6' R > 12' 1170 lb

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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.