Thermal Energy Transfer

Thermal Energy

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Thermal Energy

Thermal Energy → sum of the kinetic and potential energy of all the particles in an object; thermal energy of an object increases as temperature increases

Heat → thermal energy that flows from something at a higher temperature to something at a lower temperature

Thermal Energy Transfer

Conduction → Transfer of thermal energy by collisions between particles in matter. Occurs in solids, liquids, & gases. Metals are the best conductors.

Convection → Transfer of thermal energy in a fluid by the movement of warmer and cooler fluid from place to place. Occurs in liquids & gases.

Radiation → Transfer of energy by electromagnetic waves. Occurs in gases only.

Multiple Choice

This type of thermal energy transfer can take place in solids, liquids, & gases when two objects are touching.

• conduction

• convection

• radiation

Multiple Choice

This type of thermal energy transfer can take place in gases only.

• conduction

• convection

• radiation

Multiple Choice

This type of thermal energy transfer can take place in fluids (liquids & gases). Rising of warmer fluid and sinking of cooler fluid forms a current.

• conduction

• convection

• radiation

Multiple Choice

The thermal energy transfer being shown in this image is...

• conduction

• convection

• radiation

Multiple Choice

The thermal energy transfer being shown in this image is...

• conduction

• convection

• radiation

Multiple Choice

The thermal energy transfer being shown in this image is...

• conduction

• convection

• radiation

Conductors vs. Insulators

Conductors - materials in which heat flows quickly

Insulators - materials in which heat flows slowly

Thermal Energy

All objects want to reach thermal equilibrium. Or, they want their temperatures to be equal.

In order to make this happen, heat will move from the hotter object to the colder object.

Heat will stop flowing once the two objects reach the same temperature, or are at thermal equilibrium.

Multiple Select

Which of the boxes in the image are at thermal equilibrium? Choose all that apply.

• A

• B

• C

• D

Multiple Select

Which of the boxes shows the correct direction of heat transfer? Choose all that apply.

• A

• B

• C

• D

Multiple Choice

If you added ice (0^oC) to a glass of water (15^oC) how would the heat move between the ice & water?

• from the ice to the water

• from the water to the ice

Multiple Choice

If you added a can of Coke (20^oC) to a fridge (5^oC), at what temperature would heat stop moving?

• when the coke is at 10 degrees and the fridge is at 5 degrees.

• When the coke is at at 6 degrees and the fridge is at 6 degrees

• When the coke is at at 5 degrees and the fridge is at 15 degrees

• When the coke is at at 20 degrees and the fridge is at 5 degrees