Question

when is moment of force​

Answer 1

The turning effect of a force is known as the moment. It is the product of the force multiplied by the perpendicular distance from the line of action of the force to the pivot or point where the object will turn.

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Answer 2

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A moment is due to a force not having an equal and opposite force directly along it's line of action. Imagine two people pushing on a door at the doorknob from opposite sides. If both of them are pushing with an equal force then there is a state of equilibrium.