| A | B |
|---|
| work | the movement of a force through a distance |
| effort forces | the force that must be applied to an object to move it |
| potential energy | the energy that an object has because of its position or structure (stored energy) |
| resistance forces | a force that resists or opposes motion |
| kinetic energy | the energy that something has because of its motion |
| Joule | the basic unit of energy used by scientists |
| Newton | a unit used to measure force |
| fulcrum | the fixed point around which a lever pivots |
| machine | a device that makes work easier by reducing the amount of force needed to do the job- something that makes work easier |
| compound machine | a machine that is made up of two or more simple machines |
| inclined plane | a simple machine with a sloping surface |
| wheel and axle | a simple machine made of two wheels of different sizes that pivot around the same point |
| lever | a simple machine made up of a bar that pivots around a fixed point |
| pulley | a simple machine made up of a wheel around which a rope or chain is passed |
