LIFESCI 3J03 Study Guide - Comprehensive Midterm Guide: Free Body Diagram, Ground Reaction Force, Worm Drive
5 Oct 2016
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Life sci 3j03 lecture 3 laws of levers. Definition: a lever is a rigid body with one fixed point (fulcrum) about which the body can be rotated by the application of forces at other points. Leverage is generally concerned with an applied force in opposition to a resistance force: applied force and the resistance force produce moments about the fulcrum that have opposite signs. Speed lever: a lever that has the force located closer to the fulcrum than the resistance: i. e. the resistance has a greater moment arm, speed lever has mechanical disadvantage. Force lever: a lever that has the resistance located closer to the fulcrum than the force: i. e. the force has a greater moment arm levers can be used to gain either a force advantage or a speed advantage. A lever that has the fulcrum between a resistance and the applied force which both act in the same direction.
