| A | B |
|---|
| Work | Result of a force moving an object |
| Energy | the ability to do work |
| kinetic energy | the energy an object has while in motion |
| potential energy | stored energy - the energy a resting object has if it were to fall |
| mechanical energy | the energy an object gets from its motion (wind up toy) |
| chemical energy | energy resulting from chemical change (car) |
| simple machine | machine made of one or two moving parts |
| efficiency | amount of work a machine can do with the energy it is given |
| friction | slows down moving objects |
| pulley | simple machine that can be used to raise and lower heavy objects |
| compound machine | machine made up of 2 or more simple machines |
| complex machine | machine made up of many simple and compound machines (car) |
| an axe used to chop wood is | a wedge |
| an axe used as a ramp | an inclined plane |
| the wheel on an wheel barrow | wheel and axel |
