Example of moment arm and line of action of force
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The moment arm or lever arm is the perpendicular distance between the line of action of the force and the center of moments. ... It may also be a reference point or axis about which the force may be considered as causing rotation. It does not matter as long as a specific point is always taken as the reference point.
Explanation:
You push on the door handle and the door rotates around its hinges (the hinges are a pivot). You exerted a force that caused the door to rotate – the rotation was the result of the moment of your pushing force. Pushing a door open is a very helpful application of moments to think about.
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