Moment from Force and Moment Arm

Easymomentslever arm
A 10 N force has a perpendicular distance of 0.4 m from its line of action to a point. What is its moment magnitude about that point?
  1. A2 N·m
  2. B4 N·m
  3. C10 N·m
  4. D25 N·m
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Answer: B. 4 N·m

Moment magnitude equals force times perpendicular lever arm: M = Fd = 10 × 0.4 = 4 N·m.
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