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On a very cold day, people can often be seen rubbing their hands together. Why do people do this?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
What keeps the Earth's oceans from freezing?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
What is the definition of an insulator?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
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?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
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?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
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?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
Of the following things that produce heat, which needs fuel?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
Which of the following types of energy can be changed into heat?
fire
heat energy from the Sun
This creates friction which produces heat to warm their hands.
friction
all of these
Jill's
A material through which energy cannot flow easily.
winter jacket
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