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Work,Energy,Machines
Lessons 1,2,3
Term | Definition |
---|---|
work | is the use of force to move an object some distance in the direction of the force |
energy | is the ability to do work |
power | is the rate at which work is done |
kinetic energy | is the energy of motion |
potential energy | is the energy an object has because of its position, condition, or chemical composition |
mechanical energy | is the energy possesed by an object due to its motion and position |
machine | is any device that helps people do work by changing the way the work is done |
mechanical advantage | is the number of times the machine multiplies the input force |
mechanical efficiency | is a comparison of a machines work output with the work input |
lever | is a simple machine that has a bar that pivots at a fixed point |
fulcrum | fixed point |
wheel and axle | is a simple machine that is made of a wheel connected to a smaller cylindrical object, the axle |
pulley | is a simple machine that has a grooved wheel that holds a rope or a cable |
inclined plane | is a simple machine that is a straight, slanted surface |