For the beam and loadings shown, determine the following: 1. Calculate the vertical force reaction at B in N. 2. Calculate the vertical force reaction at E in N. 3. Calculate the maximum positive shear force in the beam in N. 4. Calculate the maximum negative shear force in the beam in N. 5. Calculate the maximum positive moment in the beam in N.m. 6. Calculate the maximum negative moment in the beam in N.m. 7. Calculate the distance of the point of zero moment from point A in 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.