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unit 2 lessons 1-3
vocabulary
Term | Definition |
---|---|
work | the use of force to move an object |
energy | the ability to do work |
power | the rate in which work is done |
kinetic energy | the energy of motion |
potential energy | the energy an object has because of its position |
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 | comparison of a machines work output with the work input |
lever | a simple machine that has a bar that pivots at a fixed point |
fulcrum | a fixed point |
wheel and axle | a simple machine that is made of a wheel connected to a smaller cylindrical object, the axle |
pulley | simple machine that has a grooved wheel that holds a rope or a cable. |
inclined plane | a simple machine that has a straight, slanted surface |