Thermal Energy 2

Heat Transfer

Topic 1 Lesson 2: Textbook Pages 14 to 19​

Multiple Choice

In what direction does heat move?

• From Cold to Hot

• To the Left

• From Hot to Cold

• To the Right

Draw

Write the number of the match in the box next to the definition.

​The transfer of energy from one particle of matter to another particle of matter.

​​Conduction​

​The transfer of thermal energy by the movement of a fluid (a gas or a liquid).

​​Convection​

​The transfer of energy by electromagnetic waves (light energy waves).

Radiation​

​Heat Transfer Examples

Conduction

Energy transfer between particles of matter that touch directly.

• As heat is added to a material, the particles begin to vibrate more which means kinetic energy increases.

• Conduction happens through direct touch/contact between objects.​

​

Multiple Choice

Which of the following is an example of conduction?

• Making pancakes on a stove.

• Microwaving your left overs.

• Water at a rolling boil.

• Heat coming from the sun.

Convection

Heat transfer through movement of fluids.

• Fluids are materials that can flow, like liquids and gases.

• The particles at the bottom heat up and become less dense. This causes them to rise and push the colder and denser molecules down.

• This movement is called a Convection Current​

Multiple Choice

Which of the following is an example of convection?

• Making pancakes on a stove.

• Microwaving your left overs.

• Water at a rolling boil.

• Heat coming from the sun.

Multiple Choice

What causes a convection current and keeps it going?

• Hot particles sink, causing the cold particles to rise.

• Cold particles steal the heat from the hot particles.

• Hot particles rise, pushing the cold particles down toward the heat source.

• Convection currents do not move at all.

Radiation

​Heat transfer by electromagnetic waves.

• The only form of heat transfer that does not require matter.

• Heat you can feel but do not always see.

• This is how we receive heat from the sun since it is able to pass through the vacuum of space where there is not matter present for it to travel through.

Multiple Choice

Which of the following is an example of radiation?

• Making pancakes on a stove.

• Microwaving your left overs.

• Water at a rolling boil.

• Cloud formation

According to the Law of Conservation of Energy, energy cannot be created or destroyed.

It can only be moved between objects or changed into another form of energy.

​

​Energy is either transferred or transformed.

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Multiple Choice

True or False: Radiation can travel through a vacuum.

• True

• False

Multiple Choice

True or False: Radiation requires particles to travel.

• True

• False

Open Ended

Why does hot air rise and cold air sink?

Multiple Choice

Which of the following is not a method of heat transfer?

• Radiation

• Insulation

• Convection

• Conduction

Multiple Choice

In which of the following are the particles the closest together?

• Solid

• Liquid

• Gas

• Fluid

Multiple Choice

How does heat reach the Earth from the Sun?

• Conduction

• Convection

• Radiation

• Insulation