5th grade Physical Science Vocabulary

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condensation

the process by which a gas changes into a liquid.

electric circuit

the path along which electrons (electricity) flow.

energy

causes changes in matter.

evaporation

the process by which a liquid changed into a gas.

force

a push or pull on an object

gas

matter with no definite shape or volume.

gravity

a force that pulls all objects in the universe toward one another.

liquid

matter that has a definite volume but takes the shape of its container.

mass

the amount of matter in an object.

matter

anything that has mass and takes up space.

mixture

a combination of two or more different kinds of matter, each of which keeps its own physical properties.

pitch

how high or low a sound is

precipitation

any form of water that falls from clouds, such as rain or snow.

radiant energy

energy that moves in waves.

reflection

the bouncing of light off objects.

refraction

the bending of light rays when they pass from one substance into a different substance.

solid

matter that has a definite shape and volume.

solution

a mixture in which particles of the two substances are evenly mixed and cannot be easily separated.

sound

the movement of energy caused by vibrations.

thermal energy

heat energy

vibration

rapis back and forth movement of matter that produces sound.

volume

the loudness of sound.

weight

the measure of the force of gravity on an object.

friction

a force that oposses or acts against motion when two surfaces rub against each other.

magnetism

when magnetic substances are sttracted to magnets.

physical state

form the matter can take (solid, liquid, or gas)

melting point

the temperature at which a substance changes from a solid to a liquid.

boiling point

the temperature at which the substance changes from a liquid to a gas.

conductor

a material that allows energy or electricity to pass through it easily.

insulator

a material that does not allow energy or electricity to pass through it easily.

freezing point

the temperature ar which the substance changes from a liquid to a solid.

potential energy

the energy an object stores because of its position.

kinetic energy

the energy of moving objects.

light energy

a form of energy that you can see, travels in a straight line, and can move through empty space where there is no air.

heat energy

the energy of moving particles in a substance (also called thermal energy)

electrical energy

energy that is produced when electrons move from one place to another.

solar energy

energy that comes from the sun.

geothermal energy

heat energy that comes from the Earth.

sound energy

energy caused by the vibration of objects.

transparent

allows light to pass through so the image is clearly viewed.

translucent

allows some light to pass through so that the image viewed in not clear.

opaque

lets no light pass through so no image is viewed.

convex lens

a lens that is thicker in the middle than at the edges and causes light rays to spread apart.

concave lens

a lens that is thicker at the edges than in the middle and causes light rays to come together.

echo

the bouncing of sound off objects.

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