Unit 5: Heat and Energy Transfer

Anna is holding an ice cube. Why does the ice cube melt in her hand?

• Cold moves from the ice cube to her hand.

• Heat moves from her hand to the ice cube.

• Heat moves from the ice cube to her hand.

• Cold moves from her hand to the ice cube.

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Michael placed a metal spoon in a cup of hot chocolate. At first, the spoon handle felt cool. A few minutes later, it felt warm. What is the most likely reason the handle got warm?

• Heat transferred from the edge of the cup to the spoon handle.

• Heat transferred from the air around the mug to the spoon handle.

• Heat transferred directly from the hot drink to the spoon handle.

• Heat transferred from the hot drink to the spoon and then up to the spoon handle.

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A car engine has a lot of moving parts. When these parts move they rub together which causes friction. Friction can cause the car engine to overheat. Which of these reduces the amount of heat produced by friction?

• oil

• battery

• gasoline

• fan

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A substance that allows heat to pass through it is called

• insulator

• conduction

• conductor

• convection

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Heat is transferred from

• cold object to a hot object

• hot object to a cold object

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The ability to do work is called

• energy

• evaporation

• freezing

• friction

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Cara was rubbing lotion on her hands. At first, her hands stayed cool. But her skin began to get warm as it absorbed the lotion. What is the most likely reason Cara’s hands stayed cool while there was lotion between them?

• The lotion increased the friction between her hands.

• The lotion contained ingredients that cooled her skin.

• The lotion contained ingredients that warmed her skin.

• The lotion decreased the friction between her hands.

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The direct transfer of heat between two objects touching

• convection

• radiation

• conduction

• condensation

Why is steam used to cook food?

• Steam is able to move through small spaces.

• Steam can transfer heat between objects.

• Steam is a form of water.

• Steam does work on objects.

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Heat is transferred through liquids by

• conduction

• convection

• evaporation

• radiation

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