Heat Transfers

Which shows an example of convection?

• Jose cooks an egg in a pot of boiling water.

• Clara burns her band by touching a light bulb.

• Lucy wraps herself in an electric blanket to keep warm.

• Ben holds the end of a metal rod in a fire to cook hot dogs.

How does heat energy from the Sun reach Earth?

• radiation

• solar winds

• conduction

• convection

Which is an example of radiated heat for cooking?

• cooking a pot of soup

• scrambling eggs on the stove

• grilling hot dogs over a campfire

• frying hamburgers in a frying pan

What is the definition of RADIATION

• Hot liquid or air that expands, becomes less dense, and rises or becomes more dense, and sinks.

• When heat is transferred from objects like rays of light or electromagnetically.

• When heat transfers from objects that are touching.

• When heat transfers through the heater or AC in your house.

You're holding hands with your best friend. Your friend's hands are REALLY warm and your are really cold. After a few minutes, this has changed. How might you explain what happened?

• The cold energy from your hand transferred to your friend's hand through conduction.

• The heat energy from your friend's hand transferred to your hand through convection.

• The cold energy from your hand transferred to your friend's hand through convection.

• The heat energy from your friend's hand transferred to your hand through conduction.

Heat transfers from an area of ____temperature to an area of ___ temperature.

• high to high

• low to high

• high to low

• It can travel high to low and low to high.

Which direction will the heat flow while this person holds a hot cup of tea?

• From the cup to her hand

• From her hand to the cup

• no heat is transferred

• Heat does not move

Answer explanation

Molecules in cold things move more _________

than in hot things.

• quickly

• speedy

• slowly

• rapidly

Which is the best example of conduction?

• boiling a pot of water

• feeling heat from a fireplace

• a hot air balloon rising and falling

• touching a hot handle and getting burned

Sarah is stirring her hot chocolate with a metal spoon, and she notices that the spoon is getting hot. This is most likely caused by which type of heat?

• convection

• conduction

• radiation

• insulation