Discussion
A load whose torque varies in direct proportion to speed arises from
Answer: C
Correct answer: viscous friction
Viscous friction produces a resisting torque proportional to the velocity, which is the defining property of a damper. Stirring a liquid, an eddy current brake and the damping term in any mechanical model all behave this way. Windage is a square-law effect, the hoist is constant-torque, and the coiler is constant-power - each of the four classes appearing separately in this topic.
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