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A lever is a rigid bar that transmits and modifies force by turning at a fulcrum point when forces are applied at two other points, and has been used by humans and other animals for over 200,000 years to break open food and throw spears. Common first-class levers include see-saws, crowbars, and pliers, while common second-class levers are doors, wheelbarrows, and staplers, and third-class levers include brooms, hoes, fishing rods, and baseball bats.

Author

rajikrajan

Language

EN