| A | B |
|---|
| Matter | anything that has mass and takes up space |
| Mass | the amount of matter an object has |
| Weight | the measure of the amount of gravity acting on an object's mass |
| Volume | the amount of space taken up by matter |
| Density | the amount of mass an object has in a known volume |
| Solid | a state of matter that has a fixed shape and volume |
| Liquid | a state of matter that has a fixed volume, but its shape changes to match the shape of its container |
| Gas | a state of matter that does not have a fixed shape or volume |
| State | one of the three main forms of matter |
| physical change | a change in the appearance of matter without actually changing the matter itself |
| physical property | a characteristic of matter that can be observed or measured and can be changed withour changing the matter itself |
| property | a characteristic used to describe matter |
| texture | how a substance feels or looks |
| odor | how a substance smells |
| conductor | a substance that allows electricity to easily travel through it |
| insulator | a substance that does not allow electricity to pass through it easily |
| magnetic | a description of substances attracted to magnetic force |
| boiling point | the temperature at which a substance changes from a liquid to a gas |
| melting point | the temperature at which a substance changes from a solid to a liquid |
| force | a push or pull |
| motion | movement |
| friction | a force that works against motion |
| gravity | the force that pulls objects toward one another |
| inertia | the tendency of an object to resist a change in motion |
| light | a form of energy that travels in waves and can move through empty space |
| reflection | the bouncing back of light waves off of a surface |
| refraction | the bending of light waves as they travel from one surface to another |
| convex lens | a lens that is thicker in the center and thinner at the edges, a shape that bends light inward |
| concave lens | a lens that is thinner in the center and thicker at the edges, a shape that bends light outward |
| sound | a form of energy produced by vibrating objects |
| vibrate | to move back and forth rapidly |
| energy | the ability to do work |
| solar energy | energy from the sun |
| kinetic energy | the energy of motion |
| potential energy | energy that is stored in an object |
| electricity | a form of energy produced inside particles of matter |
| current | the movement (flow) of electricity in a certain path |
| source of energy | where the energy comes from |
