Introduction to Thermal Energy

Where is water the least dense in a pot of boiling water?

• Closest to heat source

• Farthest from heat source

• Density doesn't change

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A light can be used to keep food warm because it transfers thermal energy by __________.

• conduction

• convection

• radiation

• brightness

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Kinetic energy is the energy of ______.

• Motion

• Position

• Reaction

• Sound

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Which of the following is an example of convection?

• A hair dryer is drying up your hair.

• Boiling spaghetti noodles in water

• When a car engine turns hot after being turned on.

• When the AC or heater changes the temperature

When a frying pan is touching a stove that is on, what heat transfer is happening?

• Radiation

• Conduction

• density

• Convection

Hot air balloons rise because the heated air is less dense than cold air, so as the warm rises as the molecules spread out. The cold air is pushed downward, where it is also heated and rises. This swirling movement of  air is called...

• convection

• radiation

• insulation

• conduction

The type of heat transfer that creates currents in water is called ________.

• conduction

• radiation

• convection

• density

Transfer of thermal energy through "flow" of liquids or gasses

• conduction

• convection

• radiation

What are the methods of thermal energy transformation?

• heat or electricity is directly transmitted through a substance

• use energy electromagnetc (waves sun)

• have tempratures warms/high temperatures

• all are correct

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What kind of heat transfer is occurring when the sun warms the sand?

• Conduction

• Convection

• Radiation

• Density