Heat Transfer

 Why do we wear sweaters in cold weather?

• To keep cold out.
• To generate heat.
• To reduce heat loss.
• All of the above.

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If you put a metal spoon and a wooden spoon into a pot of boiling water, one will become too hot to touch. Why? 

• Metals conduct heat better than wood.
• Wood conducts heat better than metals.
• Metals pull in heat because heat is attracted to metals.
• Wood isn’t as strong as metals.

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On a hot day, the upstairs rooms in a house are usually hotter than the downstairs rooms. Why?

• Cool air is less dense than hot air.
• Warm air rises and cool air sinks.
• The roof insulation warms the air.
• Heat rises.

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NGSS.MS-PS1-4

1.  You have a can of soda in your lunchbox that you want to keep cold. Which material will work best to keep it cold?

• Aluminum foil wrapped around the soda because metals transfer heat energy easily.
• A paper towel wrapped around the soda because paper soaks up the moisture.
• Wax paper wrapped around the soda because wax paper traps the moisture.
• Your wool sweater wrapped around the soda because wool traps air.

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NGSS.MS-PS3-3

When you hold a metal coat hanger in a camp fire to roast a marshmallow, the coat hanger might become too hot to hold. Why might the coat hanger get too hot?

• The heat radiates along the coat hanger.
• The heat builds up near the flame until it can’t hold it anymore and then moves     along the coat hanger.
• Metal atoms vibrate with more energy when they get hot, and they collide with   atoms near them, which causes the neighboring atoms to vibrate.
• Since metals melt in fire, they react strongly to fire and get hot easily.

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An aluminum plate and a plastic plate have been in the freezer all night long. When you remove them the next morning,

• The plates are the same temperature.
• The plastic plate has a higher temperature.
• The plastic plate has a lower temperature.
• The aluminum plate has a lower temperature.

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Temperature is a measure of…

• Cold

• Average Kinetic Energy

• Light Energy

• very hot objects only

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What is the only method of heat transfer that DOESN’T require matter ( for example waves that travel through space) ?

• Conduction

• Convection

• Radiation

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What method of heat transfer uses direct contact or touch?

• Conduction

• Convection

• Radiation

What method of heat transfer uses currents of liquids or gases?

• Radiation

• Conduction

• Convection

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