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unit 2, lesson 1,2,3
Term | Definition |
---|---|
work | the use of force to move an object some distance in the direction of the force |
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 been position, condition, or chemical composition |
mechanical energy | the energy possessed by an object due to its position and motion |
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 | a simple machine that has a bar that pivots at a fixed point |
fulcrum | this fixed point is called |
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 straight, slanted surface |