Thermal Energy & Transforming Energy

Which example illustrates the transfer of energy through radiation?

• Feeling warmth when you sit in a sunny place

• Feeling warm air while standing in front of the blower from a heating system

• Feeling the warmth of the bricks around a fireplace by

  touching them with your hand

• Feeling warmth on the soles of your feet when you walk along a beach on a sunny day

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Many homes are insulated with batting made of puffy fiberglass. How does this type of fiberglass help keep

homes warm in winter?

• The fiberglass batting generates warmth, which is carried into the house by convection

• Fiberglass absorbs energy during the day and then radiates energy toward the home at night

• Fiberglass batting slows the flow of energy because it is made of glass, which is a good insulator

• Air trapped in the fiberglass batting is a good insulator, so it slows the transfer of energy from the house

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Inside a room, the air is often warmer near the ceiling than

near the floor. Which process accounts for this difference in temperature?

• Conduction

• Convection

• Insulation

• Radiation

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Lisa has a bottle of water. How can she increase the thermal energy of the water?

• By pouring the water into a larger bottle

• By increasing the temperature of the water

• By placing the bottle of water in the refrigerator

• By dividing the water between two identical containers

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How does heat affect the thermal energy of an object that is colder than the air that surrounds it?

• Heat decreases the thermal energy of an object as energy moves to the air

• Heat causes the thermal energy of the object to increase as energy moves from the warmer air to the colder object

• Heat has no effect on the thermal energy, but it increases the potential energy of an object

• Heat is not related to thermal energy, so it cannot affect the thermal energy of an object

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As energy in the form of heat is added to an ice cube, it begins to melt. What causes melting?

• Heat causes the molecules in the ice cube to expand and forces them apart

• Heat removes thermal energy from the ice cube and causes it

  to become liquid water

• The additional energy causes the bonds between hydrogen and oxygen in the ice cube to break

• The transfer of thermal energy to the ice cube causes its molecules to move faster

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While on vacation, Carine rides in a hot-air balloon. To make the balloon rise, the pilot turns on a flame to warm the air inside the balloon. How does the air change?

• The temperature of the air decreases

• The air particles move closer together

• The motion of the air particles increases

• The air changes to a different state of matter

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Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back to

the ground. At what point does kinetic energy convert to potential energy?

• While the baseball is stopped in the air

• Just after the baseball hits the ground

• When the baseball is rising

• When the baseball is falling

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On a cold winter day, Delia puts logs into a fireplace. Then she strikes a match and sets the logs on fire. As the

fire burns, which two forms of energy are released?

• Light and thermal

• Chemical and light

• Thermal and electrical

• Electrical and chemical

A flashlight runs on a battery. If the light is left on, the battery runs out and the flashlight stops working. Which

statement best describes what has happened to the battery’s energy?

• It has been destroyed

• It has changed to potential energy

• It has been stored as kinetic energy

• It has changed to thermal energy and light energy

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