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Motion and Forces
Question | Answer |
---|---|
Work | the use of force to move an object some distance in the direction of the force |
energy | The ability to 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 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 | is a simple machine that has a ba that pivots at a fixed point |
fulcrum | the fixed point of the lever |
wheel and axle | a simple machine that is made of a wheel connected to a smaller cylindrical object, the axil |
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. |