| A | B |
|---|
| Balanced forces | Forces that are equal in size and are opposite in direction |
| Newtons | Force is measured in this unit |
| Speed | The distance an object moves in a certain amount of time |
| velocity | an object's speed and direction of motion |
| Potential energy | stored energy |
| Compound | Simple machines can becombined to make this |
| Kinetic energy | The energy of motion |
| Gravity | The force that acts over a distance and pulls all objects together |
| Unbalanced forces | Forces not equal in size or opposite in direction |
| Acceleration | A change of speed or direction of an object's motion |
| Friction | A force that works against motion |
| Work | a force used to move an object a certain distance |
| Scissors | an example of a compound machine |
| Velocity | the speed and direction of motion |
| A newton | A unit that measures force |
| Balanced forces | When two children of equal weight sit at the opposite ends of a seesaw they create this |
| A playground seesaw | a type of lever |
| ramp | example of a simple machine |
| Inertia | The tendency of an object to stay in motion |
