Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Algebraic sum of the moments of the forces about the point is zero
Algebraic sum of the forces is zero
Sum of resolved parts in any two directions at right angles, are both zero
Two resolved parts in any two directions at right angles are equal

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Applied Mechanics and Graphic Statics
When a body of mass M1 is hanging freely and another of mass M2 lying on a smooth inclined plane(α) are connected by a light index tensile string passing over a smooth pulley, the acceleration of the body of mass M1, will be given by

g(M2 + M1 sin α)/(M1 + M2­) m/sec²
g(M2 × M1 sin α)/(M2 - M1­) m/sec²
g(M1 - M2 sin α)/(M1 + M2­) m/sec²
g(M1 + M2 sin α)/(M1 + M2­) m/sec

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Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with internal forces acting on it
Isolated joint with only body forces acting on it
None of these
Isolated joint with all the forces, internal as well as external, acting on it

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