Find the horizontal base reactions for the portal frame shown, when the vertical bars have A = 9000 mm?, I= le8 mmt, and for the horizontal bar, A = 8500 mm², I= 3e8 mm4. (*Hint: Use the principal of virtual force method)

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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.