| A | B |
|---|
| force | a push or a pull causing a change in motion |
| motion | changing the location of an object |
| push | movement away from an object |
| pull | movement toward an object |
| friction | the force that slows down an object in motion |
| gravity | natural force that pulls objects toward the earth |
| inertia | resistance to change in motion |
| velocity | speed and direction of an object in motion |
| acceleration | when a force changes speed |
| potential energy | energy that is stored in an object & ready to be released |
| kinetic energy | energy in motion |
| mechanical energy | the energy an object gains when work is placed on it |
| simple machine | an object made up of few moving parts that helps people do work easier |
| compound machine | 2 or more simple machines working together |
| wheel and axle | a machine made of 2 cylinders joined with a rod that moves when force is applied |
| pulley | a simple machine that changes the direction of force by using a wheel with a cord wrapped around it |
| screw | a cone-shaped simple machine with an inclinded plane wrapped around it |
| lever | a simple machine with a bar resting on a pivot that lifts loads when pressure is applied to one end |
| inclined plane | a simple machine that is a sloping ramp up which loads can be moved |
| wedge | a triangular shaped simple machine with a thick and a thin end used to separate objects when force is applied to the thick end |
