1.2-14 A plane frame is restrained at joints A and D, as shown in the figure. Members AB and BCD are pin con- nected at B. A triangularly distributed lateral load with peak intensity of 80 N/m acts on CD. An inclined concen- trated force of 200 N acts at the mid-span of BC. (a) Find reactions at supports A and D. (b) Find resultant forces in the pins at B and C. B Pin connection 1.5 m 4 m A 3 4 1.5 m 200 N 4 m D C 80 N/m

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Laws of Equilibrium

A body is said to be in equilibrium if the system of forces acting on the body tends to keep the body at rest, in other words, there is no translation motion or net torque on the body. Under such conditions, the equilibrium conditions are to be applied to analyze the condition. The branch of mechanics that deals with this condition is known as 'statics'. Under equilibrium, there are no net forces on the body.