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Unit 2, lesson 1-3
Work, Energy, and Machines
Term | Definition |
---|---|
Work | The use of force to move an object some distance in the direction of the force. |
Power | The rate at which work is done. |
Energy | The ability to do work. |
Kinetic energy | The energy of motion. |
Potential energy | The energy an object has because or its position, condition, or chemical composition. |
Mechanical energy | The energy possessed by an object due to its motion and position. |
Machine | Any device that helps people do work by changing the way work is done. |
Mechanical advantage | The number of times the machine multiplies the input force. |
Mechanical efficiency | A comparison of a machine's work output with the work input. |
Lever | Simple machine that has a bar that pivots at a fixed point. |
Fulcrum | The fixed point of a lever. |
Wheel and axle | A simple machine that is made of a wheel connected to a smaller cylindrical object, the axle. |
Pulley | A simple machine that has a grooved wheel that holds a rope or a cable. |
Inclined plane | A simple machine that is straight, slanted surface. |