A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if?

A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if?

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A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if the floor and wall both are smooth surfaces.

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On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be?

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