If the center of gravity of the stacked tables is at G, and the stack weighs 100 lb, determine the minimum force P that the child must apply to the stack to cause a motion. The coefficient of static friction at A and B is μs = 0.3. The tables are secured to each other

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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.