Thermal Energy Review

Thermal Energy Review

Thermal Energy

The total kinetic (motion) energy of the tiny particles that make up matter; the faster the particles move, the warmer the matter becomes. Thermal energy is the energy of HEAT.

Multiple Choice

What is thermal energy?

• Thermal energy is the energy of heat.

• Thermal energy is the energy of sound.

• Thermal energy is kinetic energy.

Heat Transfer

The thermal energy exchange between two objects of different temperatures; energy moves in a predictable pattern from warmer sites to cooler sites until all sites have reached the same temperature

Multiple Choice

What is heat?

• energy that is transferred from one object to another when the objects are at different temperatures.

• energy that is transferred from one place to another.

Thermal Energy Transfer

Conduction → Transfer of thermal energy by collisions between particles in matter. Occurs in solids, liquids, & gases. Metals are the best conductors.

Convection → Transfer of thermal energy in a fluid by the movement of warmer and cooler fluid from place to place. Occurs in liquids & gases.

Radiation → Transfer of energy by electromagnetic waves. Occurs in gases only.

Multiple Choice

What are the three ways heat can be transferred?

• convection, vibration, and radiation

• convection, conduction, and radiation

• conduction, vibration, and molecules

Conduction

Transfer of thermal energy that occurs in solids, liquids, and gases when two substances of different temperatures touch.

Multiple Choice

What is conduction?

• the transfer of heat by the sun

• the transfer of heat by no contact

• the transfer of heat by direct contact

Multiple Choice

Which is an example of conduction?

• A pot on the hot stove

• A person laying in the sun

• A pot of boiling water

Radiation

The transfer of energy by the movement of electromagnetic waves or subatomic particles.

Multiple Choice

What is radiation?

• heat transferred by the sun to the earth.

• heat transferred from one object touching another.

• heat transferred from a fireplace.

Multiple Choice

Which is an example of radiation?

• a person laying on the beach

• roasting a marshmallow

• a pot of boiling water

Convection

Heat transfer caused by the rising of hotter, less dense fluids and the falling of cooler, more dense fluids.

Multiple Choice

What is convection?

• the tranfer of heat from a campfire

• transfer of thermal energy by the movement of molecules from one part of a material to another

• the transfer of heat from the sun

Multiple Choice

Which is an example of convection?

• a pot of water is heated, boiling the water

• standing in front of a fireplace

• laying in the sun by the pool