Thermal Energy and Heat

Heat flows spontaneously from hot objects to

• hot objects.

• cold objects.

What happens to particles as they heat up?

• They slow down
• Nothing
• They don't move
• They speed up

What happens to particles as they cool down?

• They slow down
• Nothing
• They don't move
• They speed up

As you touch a hot stove the heat transfers -

• from your hand to the stove
• from the stove to your hand
• It doesn't transfer

Which particles are moving fastest?

• Particles in ice.

• Particles in boiling water.

• Particles in water from the sink.

• Particles in steam.

Thermal energy stops moving when the objects have the same temperature.

• True
• False

Conduction is heat transfer by -

• Touch
• Circles
• Waves

Radiation is heat transfer by-

• Touch
• Circles
• Waves

Which example below is an example of radiation?

• Standing on a hot metal bridge
• The attic is warmer than the basement
• The Sun heating the Earth
• Touching hot sand with your feet

This is an example of-

• Conduction
• Convection
• Radiation