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### 18 Cards in this Set

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• Back
 Chemical Energy is energy from chemical changes. Complex machine is a machine made of many simple and compound machines. Compound machine is a machine made of two or more simple machines. Efficiency is the percent of useful work obtained from machines. Effort arm is the distance from the fulcrum to where the effort is put on a lever. Energy is the ability to do work. Friction is a force that acts against the motion of one surface over another. Fulcrum is the point where a lever is supported. Gravity is the force that pulls things toward the center of the earth. Inclined plane is a flat surface that is tilted. Inertia is the tendency of an object to stay in motion or a resting object to stay still. Lever is a simple machine used to hold objects together (nail) or lift objects (seesaw, crowbar, hook end of hammer) Pulley is a simple machine made of a wheel and a rope. Simple machine is a machine made of only one or two parts. Wedge is a simple machine used to cut or split an object. Wheel and axle are a simple machine that has a center rod (axle) attached to a disc (wheel). Mechanical energy is the energy an object gets from its motion. Effort is the force used on a lever.