Conduction and Insulation

You probably use the term heat many times a day. As an example, when you cook dinner, you heat your dinner on a hot stove. When you place a piece of cool metal in the sun, it is heated by the sun’s energy. Why is heat the correct term to use in these examples?

• They show that when objects are touching, they are the same temperature.

• They show that heat flows from something warmer to something cooler.

• They indicate that heat is created to raise the termperature of something.

• They indicate that the kinetic energy of the particles decreases when something is heated.

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Click the statement that is true.

• Thermal energy transfers from the cooler object to the warmer object.

• Thermal energy transfers from the warmer object to the cooler object.

• Thermal energy does not transfer at all.

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• Convection Current

• Conduction

• Radiation

• Night

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What is an example of a good insulator?

• wood

• copper wiring

• stones

• concrete floor tiles

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A student likes to attend football games, no matter how cold and snowy the weather becomes. She is going to a game on a very cold day and takes along a hand warmer. She activates it and tucks it into the glove she is wearing. She holds her hands together, and before long, her hands are warm. Which best describes how her hands were warmed?

• Heat was transferred by conduction, resulting in an increase in kinetic energy.

• Heat was transformed by convection, resulting in the conservation of energy.

• Thermal energy was transferred by currents, resulting in an increase in kinetic energy.

• Heat was transformed by radiation, resulting in an increase in kinetic energy.

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When food is cook in a microwave, radiation is giving off through what scientific concept?

• Boyle's Law

• Charles' Law

• The Law of Conservation of Mass

• Electromagnetic Spectrum

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A student gets ready to go to school one day, and he finds out that his car's battery is dead. The headlights will not come on, and the car won’t start. What transformations usually happen when the battery is active and the headlights come on?

• chemical → electrical → light

• electrical → kinetic → light

• light → electrical → chemical

• thermal → electrical → light

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True or false? Conduction involves DIRECT CONTACT between two objects?

• True

• False

A new home had a wooden floor put down in cool weather. As the weather became warmer, the floor started to buckle, rising up in the middle of the floor. The floor was fixed by trimming the edges of the floor so that there was a space between the flooring and the wall. Choose the response that best explains why this helped to make the floor flat again.

• The particles in the floor decrease in thermal energy in warm weather, decreasing the kinetic energy of its particles and making it expand. Trimming it gave it room to expand.

• The particles in the floor increase in thermal energy in warm weather, increasing the kinetic energy of its particles and making it expand. Trimming it gave it room to expand.

• The particles in the floor decrease in thermal energy in warm weather, decreasing the kinetic energy of its particles and making it contract. Trimming it gave it room to contract.

• The particles in the floor increase in thermal energy in warm weather, increasing the kinetic energy of its particles and making it contract. Trimming it gave it room to contract.

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What is not an example of thermal expansion

• A hot air balloon rising in the air

• A cold sidewalk on a winter day.

• A bag of popcorn cooking in the microwave

• A hot dog cooking on a grill

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