diagram 1

a plan, sketch, drawing, or outline made to show how something works or to show the way parts are put together 2

force 3

a push or a pull that causes an object to move, stop, or change direction 4

gravity 5

the force that pulls all things in the universe toward each other; the force that pulls things down on Earth 6

magnetism 7

a force that pulls iron or steel across a distance; a force that attracts or repels magnetic material 8

friction 9

a force that resists motion when objects rub against each other 10

motion 11

a change in the position of an object 12

Simple machine 13

a device with few or no moving parts that changes the size or direction of a force 14

energy 15

the ability to make a change in matter 16

electricity 17

energy that flows through a circuit and can create light, heat, magnetism, sound, or other effects 18

Electric circuit 19

a closed path where electricity can flow 20

electromagnet 21

a temporary magnet created when electricity passes through wire wrapped around an iron bar 22

Thermal energy 23

heat energy caused by the movement of molecules in an object 24

conduction 25

the direct transfer of heat between objects that touch 26

convection 27

heat moving from one object to another caused by mixing a liquid or a gas 28

radiation 29

the movement of thermal (heat) energy by electromagnetic waves, such as light waves from the sun 30

Sound energy 31

a change in matter made by vibrating objects 32

vibrate 33

to move back and forth 34

pitch 35

how high or low a sound is

Volume (in relation to sound) 37

the loudness or amount of a sound 38

conductor 39

a material that allows energy to flow through it easily 40

Insulator 41

a material that does not allow energy to flow through it easily 42

Light energy 43

a form of energy that travels in waves and can be seen with our eyes 44

reflect 45

when light rays bounce off an object 46

refract 47

when light rays bend 48

absorb 49

to take in and hold inside 50

Fossil fuels 51

materials formed from decayed remains of ancient plants and animals that are burned to produce heat; coal, oil, and natural gas 52

Solar energy 53

energy from sunlight 54

Mechanical energy 55

energy of motion 56

Potential energy 57

energy that is stored in a material because of its position or condition 58

Kinetic energy 59

energy of a material in motion 60