Unit 5 Test: Thermal Energy

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of the particles in a substance, which is related to its temperature.

Front

What are the three types of thermal energy transfer?

Back

Conduction, Convection, and Radiation.

Front

Define conduction.

Back

Conduction is the transfer of thermal energy through direct contact between materials.

Front

Define convection.

Back

Convection is the transfer of thermal energy through the movement of fluids (liquids and gases) caused by differences in temperature and density.

Front

Define radiation.

Back

Radiation is the transfer of thermal energy through electromagnetic waves, such as sunlight.

Front

What happens to water molecules when water is heated?

Back

When water is heated, the molecules gain energy and move faster.

Front

What happens to water molecules when water is cooled?

Back

When water is cooled, the molecules lose energy and slow down.

Front

What are convection currents?

Back

Convection currents are the circular movements of fluid caused by the rising of warmer, less dense fluid and the sinking of cooler, denser fluid.

Front

How does the sun warm the Earth?

Back

The sun warms the Earth through radiation, as sunlight travels through space and heats the surface.

Front

What is an example of conduction in everyday life?

Back

An example of conduction is when a metal spoon becomes warm after being placed in a hot soup.