Understanding Heat Transfer

What happens to the thermal energy of an object when its molecules move more slowly?

• The object remains at the same thermal energy level.

• The object loses thermal energy.

• The object gains thermal energy.

• The object becomes invisible.

Which method of heat transfer occurs when you feel warmth from the sun without touching it?

• Radiation

• Evaporation

• Conduction

• Convection

How does heat transfer occur when a metal spoon is placed in hot cocoa?

• By evaporation of the cocoa

• Through radiation from the cocoa

• By conduction from the cocoa to the spoon

• By convection currents in the spoon

What causes the water at the bottom of a pot to rise when heated?

• The water evaporates.

• The water becomes less dense.

• The water becomes more dense.

• The water freezes.

What is a real-life example of a convection current?

• A metal spoon heating up in hot cocoa

• Feeling the warmth of the sun

• A pot of water boiling on a stove

• Lava rising and falling in a lava lamp