8th grade science unit 2 flashcards

Thermal energy

Heat Energy

When an object gets colder, what happens to thermal energy?

Thermal energy is taken away

When an object gets hotter, what happens to thermal energy?

Thermal energy is added

Water molecules can slide past each other

liquid

Water molecules only vibrate and are packed together

solid

water molecules are spread apart and move around

gas

water molecules contain the lowest amount of thermal energy

solid

water molecules contain the highest amount of thermal energy

gas

water molecules contain a medium amount of thermal energy

liquid

when liquid changes to solid, thermal energy is

removed from the object

matter

anything that has mass and takes up space

mass

the amount of matter that makes up an object

heat

Transfer of Thermal Energy from one object to another

heat flows from

warm objects to colder ones

temperature

Measure of how hot or cold something is.

Measure of the average kinetic energy

As an object gains thermal energy, the molecules move

quicker and move apart.

As an object releases thermal energy,

the molecules move more slowly and move together.

kinetic energy

energy in motion

Potential energy

stored energy