| A | B |
|---|
| Chemical Change | a change that occurs in substances that cannot be reversed or undone, such as a piece of wood burning or iron changing into rust |
| Circuit | a closed path through which electricity travels |
| Conductor | material that allows energy to travel through it easily or quickly |
| Cycle | a system that repeats its steps over and over again |
| Energy | the ability to do work; the ability to cause change and mke things happen |
| Friction | a force that opposes or acts against, motion when two surfaces rub against each other |
| Force | a push or pull on an object |
| Gas | a state of matter in which the molecules are very far apart |
| Inertia | the tendency of a moving object to keep miving or of a still object to remain at rest |
| Inexhaustible resource | a resource that cannot be used up |
| Insulator | material that prevents energy from traveling through it easily or quickly |
| Lens | an object used to refract light |
| Liquid | the state of matter that has a definite volume and takes the shape of the container it is placed in, such as water |
| Magnet | tool used to determine the force of push or pull that an object has |
| Magnetism | the force of push or pull between the poles of magnets |
| Mass | the amount of matter in an object |
| Matter | anything that has mass and takes up space |
| Mixture | a collection of materials in which the materials do not join together |
| Molecule | the units that make up matter in its solid, liquid or gas forms |
| Motion | change in an object's position |
| Reflection | the bouncing of light from a surface, such as a mirror or tinted car window |
| Refraction | the bending of light, such as in eyeglasses or a telescope |
| Solid | a state of matter in which the molecules are tightly packed together |
| Solution | a type of mixutre in which the ingredients are thoroughly mixed together |
| Sound | a form of energy in which vibrations can be heard |
| Vibration | the back-and-forth movement of an object that produces sound |
| Wave | the way in which light and sound energy travel |
| Weight | the measure of the pull of gravity on an object |
