Generation Genius: Heat Transfer

What is heat in terms of thermal energy?

• The motion of molecules within an object.

• The transfer of thermal energy between objects.

• The amount of energy stored in an object.

• The temperature of an object.

Why did the thinner copper rod melt the chocolate faster in the experiment?

• It had fewer atoms, so it heated up more quickly.

• It was made of a different material than the thicker rod.

• It was closer to the heat source than the thicker rod.

• It absorbed less thermal energy than the thicker rod.

What happens to particles when they are heated during convection?

• They stop moving and stay in place.

• They vibrate slower and become denser.

• They spread further apart and rise.

• They move closer together and sink.

How does radiation transfer thermal energy?

• Through circulating liquids or gases.

• Through the movement of dense particles.

• Through direct contact between objects.

• Through waves, such as infrared light.

Why does a hot air balloon rise when the air inside is heated?

• The air becomes denser and pushes the balloon upward.

• The air becomes less dense and allows the balloon to rise.

• The flame creates radiation that lifts the balloon.

• The balloon absorbs thermal energy and expands.