Energy Transfer Practice

Laura bruised her knee.  She applied an ice pack to the bruised area.  When she removed the ice pack from the injured knee, she noticed that the temperature of her skin was lower than the rest of her body.  What is the most likely reason this occurred?

• Increased blood flow due tothe ice pack caused the skin to be cooler
• The cooling energy of the ice pack was transferred to the skin.
• Heat energy from the skin was transferred to the ice pack.
• The air surrounding the ice pack cooled the skin.

Elaine investigated how well different materials conducted heat. She had samples of metal, wood, plastic, and rubber that were each the same size. Elaine put each sample in boiling water for five minutes and then measured its temperature. She put her results in the table.
Heat InvestigationMaterialTemperature
(°C)   Metal 36  Wood 31  Plastic 27  Rubber 30 
Based on the data, which material is the best conductor of heat?

• metal
• wood
• plastic
• rubber

Which of these materials transfers heat energy quickest?

• metal
• glass
• plastic
• wood

A student standing near a campfire feels warmer as the fire grows. Which process most likely transfers heat from the campfire to the student?

• conduction
• convection
• radiation
• transformation

Which of the following is the best conductor of heat?

• oven mitts
• a metal bowl
• a wooden spoon
• rubber soled shoes

One end of a metal rod is placed over a flame during an investigation. A thermometer is touching the opposite end of the metal rod. Which best describes what is happening during this investigation?

• Convection carries heat to the thermometer
• Radiant energy warms the thermometer.
• Mechanical energy from the flame carries heat to the thermometer.
• Heat from the flame is conducted through the metal rod to the thermometer.

Why does a floor covered with tile feel colder than a floor covered with carpet?

• The tile floor is colder than the carpet.
• The tile floor conducts heat better than the carpet.
• The carpet conducts heat better than the tile floor.
• The tile floor is a better insulator than the carpet.

The following advertisement was placed in the window of a camping supply store.
“The double-thermal ‘Polar Snooze’ sleeping bag is here! It will keep you warm for winter camping!”
Based on this advertisement, the best conclusion about Polar Snooze sleeping bags is that they

• are lightweight.
• have insulation.
• make winter camping easy.
• cost less than other sleeping bags.

Which substance can be used to conduct electricity in a circuit?

• rubber
• metal
• wood 
• plastic

Which feature is a physical property of copper?

• insulates heat
• strong magnetic force
• conducts electricity
  
• liquid at room temperature