Thermal energy

Question 1

What’s the difference between the temperatures and thermal energy?

Answer 1

Temperature is the average kinetic energy of molecules in a substance and thermal energy is the sum of kinetic and potential energies of all the molecules in a substance

Question 2

If you have a large and a small glass of juice, both at room temperature, which one has more thermal energy?

Answer 2

The larger glass of juice because it has more molecules. More molecules means more thermal energy- it has more kinetic and potential energy.

Question 3

__________is the transfer of heat through the movement of a fluid such as water or air.

Answer 3

Convection

Question 4

What kind of heat transfer happens in a microwave?

Answer 4

Radiation

Question 5

When you lick a popsicle, how does the thermal energy travel between the popsicle and your tongue? What kind of heat transfer is that?

Answer 5

Heat travels from warmer to cooler objects, so thermal energy is transferred from your tongue to the popsicle, melting the popsicle. This kind of heat transfer is conduction.

Question 6

When an object heats up, it __________.
When an object cools down, it___________.

Answer 6

Expands, contracts

Question 7

Thermal energy always moves from______to ______energy.

Answer 7

When an object heats up, it________.
When an object cools down, it_________.