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The moment arm of a force about a specific axis of rotation can be found geometrically by constructing the force's line of action and then finding the shortest distance between the line of action and the axis. The procedure is shown in the figures below.

!vertmarm1.png:size=60%!

!vertmarm2.png:size=60%!

!vertmarm3.png:size=60%!

Given forces.

Construct line of action for each.

Find the shortest distance
(shortest distance always
perpendicular to line of action).

Key Points

Some key points to remember:

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