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Rotational Equilibrium doubt. Rigid Body Dynamics. Please refer the attachment...
see answer below. If an object is under the influence of forces which are in equilibrium, then that object is not accelerating - there is no net force acting. When a body is acted on by three co-planar forces then the lines of action of the three forces must all pass through the same point. The weight is vertically downwards from the centre of the ladder. The wall (being smooth) exerts a force normally outwards (at 90o) on the ladder. When you extend these two, you find that they cross. As the ladder is in equilibrium (stable) the force from ground on the base of the ladder must be directed upwards towards the crossing point. The force from the ground is the result of two forces - the normal force from the ground and friction acting along the ground
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