Which of the following is a way to produce heat?

On a very cold day, people can often be seen rubbing their hands together. Why do people do this?

Boris rides his bicycle at a high speed, then stops suddenly using the brakes. After his ride, Boris feels the rubber on the tires of his bicycle. The rubber feels warm. What, most likely, is the source of this heat?

Which of the following types of energy can be changed into heat?

Of the following things that produce heat, which needs fuel?

Why do people put insulation in the walls and ceilings of their homes?

What is the definition of an insulator?

Insulation is used in many places. It is used in refrigerators and freezers, in the walls of homes, and even in clothing. In which of the following clothing items would insulation be the most useful?

Jack and Jill poured hot chocolate from the same container into different thermoses. At lunch time, the temperature of Jack's hot chocolate was 80° F. The temperature of Jill's hot chocolate was 85° F. Whose thermos has better insulation?

What keeps the Earth's oceans from freezing?

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