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Forces causing rotation: levers and gears

Forces and motion • Moments, levers, and gears

Key concepts

What you'll likely be quizzed about

  • A lever amplifies an input force to lift heavy loads.
  • It consists of a beam pivoted at a point called the fulcrum.
  • Depending on the positions of the input force and the load, different classes of levers can affect the output force and distance moved.
  • When the input force is applied, it creates a moment around the fulcrum, allowing the load to be lifted more easily than using force alone.

Flashcards

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What is a lever?

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A lever is a rigid beam that pivots at a fulcrum, used to amplify an input force.

Key notes

Important points to keep in mind

A lever's mechanical advantage depends on fulcrum placement.

Gears efficiently transfer rotation with minimal slippage.

Higher gear ratios increase torque at lower speeds.

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