KPE160H1 Study Guide - Midterm Guide: Angular Momentum, Angular Velocity
31 Jan 2017
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The law of conservation of energy: energy can never be created or destroyed, but can only be converted from one form to another. Levers do two main things: increase the force, and increase the distance or speed that the lever can be moved with. Increasing force: levers that increase force make it easier to do work. When the force arm is longer than the resistance arm, the lever magnifies force. Although this works, since the axis is close to the load, it can only move the load a little bit slowly. Increasing speed: this happens when the force arm is shorter than the resistance arm. Class i lever (teeter-totter: the fulcrum (axis) is located between the force and the resistance (load) Class ii lever (wheel barrow: the resistance is between the force and the axis. Class iii lever (snow shovelling: the force is between the axis and resistance, most common in the human body.
