alleryStart learning →What is a lever?
AA wheel turning freely on a fixed axle
BA flexible cable running over a pulley
CA rigid bar pivoted at a fixed fulcrum
DA sloping surface used to raise a load
Answer & Solution
Correct answer: C. A rigid bar pivoted at a fixed fulcrum
1. A lever is a rigid bar pivoted at a fixed place, and that pivot is called the fulcrum.
2. Because there is rotation about a pivot, torques govern how the lever behaves.
3. Crowbars, seesaws and nail pullers are all levers of this kind.
4. A sloping surface is the inclined plane, a different simple machine.
_Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.5 Simple Machines_
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