Structural Kinesiology Module 1 Practice Exam

Which term describes the distance between the axis of rotation and the line of action of the external force?

External Moment Arm Lever Arm Moment Arm Torque Arm

Correct Answer:

External Moment Arm

Explanation:

The distance in question is the moment arm—the perpendicular distance from the axis of rotation to the line of action of the force. Because the force is described as external, the precise term is the external moment arm. This distance is what, when multiplied by the force, gives the torque produced about the axis. While lever arm and moment arm are often used interchangeably in a general sense, specifying “external” makes clear we’re talking about an external force relative to the body, distinguishing it from an internal (muscle) moment arm. Torque arm isn’t a standard term in this context.

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