click below
click below
Normal Size Small Size show me how
Unit 2
work, energy, and power
Term | Definition |
---|---|
work | the use of force to move an object some distance in the direction of the foce. |
energy | the ability to do work. |
power | the rate at which work is done. |
kinetic energy | the energy of motion. |
potential energy | the energy an object has because of its postion, conditions, 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. |
mechancial advantage | the number of times the mechine multiplies the input force. |
mechanical effciency | a comparison of a machine's work output with the work input. |
lever | a simple machine that has a bar that pivots at a fixed point. |
fulcrum | the fixed point. |
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 a starght, slanted surface. |