Determine whether the 15-kg block shown is in static equilibrium under the loadings shown, and report the magnitude of the friction force (in Newton) when P = 760 N and = 43 degrees at the state of static equilibrium. The coefficients of static and kinetic friction between the block and the rough inclined surface are shown in the picture. Report the friction force as positive when it is directed downward, and negative when it is directed upwards. 500 N Ms = 0.35 με = 0.25 35° P

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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.