Conduction and Insulation

1.

Multiple Choice

2 mins

1 pt

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.

2.

Multiple Choice

2 mins

1 pt

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.

3.

Multiple Choice

2 mins

1 pt

Convection Current

Conduction

Radiation

Night

4.

Multiple Choice

2 mins

1 pt

What is an example of a good insulator?

wood

copper wiring

stones

concrete floor tiles

5.

Multiple Choice

2 mins

1 pt

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.

6.

Multiple Choice

2 mins

1 pt

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

7.

Multiple Choice

2 mins

1 pt

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

8.

Multiple Choice

2 mins

1 pt

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

True

False

9.

Multiple Choice

2 mins

1 pt

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.

10.

Multiple Choice

2 mins

1 pt

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

11.

Multiple Choice

2 mins

1 pt

What is happening when a balloon's kinetic energy decreases and it gets smaller?

Expansion

Desolation

Radiation

Contraction

12.

Multiple Choice

2 mins

1 pt

A family replaced the windows in their home with double-hung windows. This helps because a layer of gas between the two panes of glass acts as a good _______________

insulator

conductor

transformer

transfer

13.

Multiple Choice

2 mins

1 pt

What does "the law of conservation of energy" mean?

Energy can be created

Energy cannot be created but can be destroyed.

Energy can be destroyed and created.

Energy can never be created or destroyed.

14.

Multiple Select

2 mins

1 pt

You are camping, and it is time to build a campfire. You gather logs and stack them loosely, and then you add small twigs and leaves to make the fire easy to light. As you sit by the fire, the logs burn bright in the darkness, and you feel the heat coming toward you. Which of these statements are true about the amount of energy transformed in the camp fire? Choose the two that apply.

The Law of Conservation of Energy applies to these transformations.

The chemical energy in the logs is lost during the transformation.

The fire is hotter than the logs were, so energy is gained in this transformation.

The amount of heat and light energy released equals the amount of chemical energy that is burned.

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