Conduction, Convection, and Radiation, D.B.M.

Lesson Plan for Heat transfer

I. Objectives:

A. Given the available materials, the learners should be able to:

1. identify the three method of heat transfer;

2. differentiate the three method of heat transfer;

3. perform an activity about heat transfer;

4. develop and manifest the value of safety and consciousness; and

5. get 10 out of 15 on the test correctly.

II. Subject Matter

A. Topic: “Heat Transfer”

B. Concepts/topics

1. The three method of heat transfer are conduction, convection, and radiation.

2. Conduction is the transfer of heat energy by molecular and electron collision

within a substance.

3. Convection is transfer of heat energy in gas or liquid by means of currents in

the heated fluid. The fluid moves, carrying energy with it.

4. Radiation is the transfer of heat by way of electromagnetic waves.

C. Materials

2 Small transparent jars

2 Big transparent jars

2 Conducting wire

Food Coloring

Tap water

Hot water

4 Candle

D. References

Abastillas, V. N. (2002). High School Physics. 937 Quezon Avenue, 1104 Quezon

City Philippines: SIBS Publishing House, Inc.

Hewitt, P. G. (2002). Conceptual Physics 9th Edition. 1301 sansome Street, San

Francisco, CA 94111: Pearson Education Publishing..

Padua, A. L., & Crisostomo, R. M. (2003). Practical and Exploratioal Physics:

Modular Approach. 1253 G. Araneta Ave., Quezon City: Vibal Publishing

House, Inc.

Vern J. Ostdiek, Donald J. Bord. (2011). The World of Physics. ESP Printers, Inc.

III. Learning Task

Teacher’s Task Learner’s Task

A. Routine Activity

1. Prayer

2. Greetings

Good morning!

One of the cleaners leads the

prayer.

Good morning, teacher! We’re

glad to see you. Mabuhay!

Conduction, Convection, and Radiation, D.B.M.

Ok, please be seated.

3. Attendance

a. Class secretary, do we have any

absentee?

4. Recall

Yesterday, we started our discussion

about heat. We differentiated heat and

temperature, we also introduced the

concept of heat transfer.

The teacher posts a picture of ice on a

hand on the board.

John, what can you infer about the

picture? What happens to the ice after

some time?

Very good! Thank you.

In addition we also come up with the

idea that there should be temperature

difference to transfer heat. In that case

the hand is hotter than the ice.

This day, we will dig more to understand

fully the concept of heat transfer.

5. Motivation: Time to cook.

a. Imagine yourself as a cook, and your

Mom ask you to make a dish for her.

The teacher gives pieces of paper and

let the student write their answer and

post it on board.

What materials do you think the best

to use?

B. Pre-activity

1. Definition of terms: Guess the word.

Before we go to our activity this

morning, there are some terms we need

to define, to further understand the

concept.

The class secretary stands up.

None, teacher. Everyone is

present.

Sir, there is transfer of heat

from the hand to the ice. The

ice melt after some time. Since

there is difference in

temperature in the two.

The students choose from the

set of words.

Answers may vary

Conduction, Convection, and Radiation, D.B.M.

The teacher let the students guess the

words by posting clues in the class.

Joseph, what do you think the first word?

Correct! Great Job

Melanie, how about the second word?

Then, Rose the last word is?

Now class, use these words in a sentence.

a. Fluid - a substance whose molecules

flow freely, so that it has no fixed

shape and little resistance to outside

stress, e.g. a liquid or gas

b. Current - flow of water or air: a

steady flow of water or air in one

direction

c. Molecule - is a group of atoms that are

bound tightly together by strong

chemical bonds.

2. Discussing Activity Procedure

a. The teacher gives the laboratory

sheets and explain one by one the

procedures of the activity.

Ok class, do you have any questions

about the procedures?

C. Activity Proper

1. Performance of the activity

a. The class will be divided into six

groups and will make discussion and

analysis based on the given data in

the laboratory activity.

2. Data Gathering

a. The students will fill out the data

sheet provided and answer the guide

questions. (The teacher provides

manila paper for the presentation of

data afterward)

The students analyze the clue

on board.

Sir, I guess it is Fluid.

Sir, it is current.

Sir, it is molecule.

None Sir.

The students go to their

respective groups.

Conduction, Convection, and Radiation, D.B.M.

D. Post-activity Discussion

1. Analysis of data gathered

Conduction

a. What is the source of heat in the

activity?

How do you say so?

Great!

b. What happens to the wax ball as you

put the wire into the candle?

Does the wax ball fell all at once?

Ok then,

c. How does the heat get from the

source to the wax?

At the time you place the wire to the

candle’s fire. Does it makes the

molecule in the wire excite?

Does it excite the molecule of the

wire all at once?

Ok now, what do you think happen

next?

Ok that’s correct.

Now can you explain in the class how

heat transfer, base on your diagram?

Class do we need a direct contact in

this method?

This method conducts heat through

direct contact. What do you think is

this method called?

The students post their answer

on the board.

The source of heat in the

activity is the candle’s flame.

Since we mention that heat

flows from higher temperature

to lower temperature, and the

candle has higher temperature.

The wax ball melted as you

put the wire into the candle.

No Sir, it fell one by one.

The heat travel from the

source to the wax by the wire.

Yes Sir, since its temperature

rise.

No Sir, it only excite the

molecule near the fire.

It moves or collides to other

molecule to molecule.

Yes Sir, we need direct

contact to transfer heat in this

method.

Conduction.

Conduction, Convection, and Radiation, D.B.M.

Convection

a. What happen to the hot colored water

inside to the small jar?

b. Where did the hot colored water

stay? Why?

How can you say it is less dense?

c. What took the place of the hot

colored water in the small jar?

d. How is heat transferred in the

activity?

Do we need fluid in this method of

transfer?

Explain the heat transfer base on the

diagram. That circulation of fluid is

called convection current.

What, now, do you call this method?

Radiation

a. How do you feel when you place

your hand above, beside and under

the source of heat?

b. Does your hand comes in contact

with the flame?

c. What is in between your hand and the

source of heat?

What if we remove the air molecule

in the space between your hand and

The hot colored water inside

to the small jar goes up as you

place it inside the big jar.

The hot colored water stayed

at the top layer of the big jar

since it is less dense than the

water in the big jar.

Since hot water is less dense

than cold water.

The tap/cold water from the

big jar took place of the hot

colored water in the small jar.

Heat is transferred by the

circulation of fluid.

Yes, the density difference of

the two fluid.

A student explains how heat

transfers base on the diagram.

Convection.

I feel the warm of the fire

when I place my hand above,

beside and under the source of

heat.

No Sir, my hand doesn’t make

a direct contact with the flame.

There is space between my

hand and the source of heat.

There is air molecule.

Yes.

Conduction, Convection, and Radiation, D.B.M.

the fire? Does heat transfer take

place?

d. How is heat transferred in this

activity?

.

Where does the heat come from?

What does the candle produce?

Does fire gives light?

So, can we say fire is light?

In our previous discussion about

light, what type of wave is light?

Does it transfer energy (heat energy)?

So, this method radiate heat by

electromagnetic wave, it means heat

transfer is possible in this method

with or without a medium.

Then, this method is name as?

2. Generalization

At the end of the presentations of the

six group, the teacher provides a one

fourth cartolina for each group.

Ok class, what have you learned

about the lesson? In your own word

define the method of heat transfer

that is assigned to your group.

The teacher presents the concept to

the class and compares it to the

students’ answers.

3. Values Integration

Class going back to our initial activity,

why did you choose the following

materials?

Candle.

Fire.

Yes.

Yes.

Electromagnetic wave.

Yes.

Heat transfer through space by

an electromagnetic waves.

Radiation.

One of the representatives of

each groups will present their

data in front of the class.

Additional information will

presented in the class.

This allows us to save energy

and keep us safe.

Conduction, Convection, and Radiation, D.B.M.

The teacher presents again the set of

words chosen by the class.

How this things keep you safe?

In what way you can save energy by

using this materials?

(wooden spatula)

I choose this material because

it prevents heat to travel to my

hand, it keeps us safe from

burning.

(Apron)

Also Sir, the apron. This thing

prevents the radiation from the

open fire.

(aluminum pan)

Sir, example the aluminum

pan, since we know the

concept of conduction we can

use it to save energy. We can

cook food with less energy.

IV. Assessment

In each of the following examples, identify whether heat is being transferred

through conduction, convection or radiation. Some may have two possible answers.

Choose the answer that best fits the situation. Write the answer before the number.

________________1. Warming hand over a radiator.

________________2. Eggs cooking in a frying pan.

________________3. Snowman melting in the sun.

________________4. Water boiling in a kettle.

________________5. Warmth from the fireplace circulating to through the house.

________________6. Tongue freezing to a metal pole.

________________7. Ice melting on a hotplate.

________________8. Freezing outside on a cold day.

________________9. Steam piping out of a teapot.

________________10. Burning your hand on a hot pan

________________11. Ice cubes keeping lemonade cold.

________________12. Laying out in the sun

________________13. Roasting marshmallows over a fire.

________________14. Making toast in a toaster

________________15. Heating a kettle on a hot furnace.

Conduction, Convection, and Radiation, D.B.M.

V. Assignment:

A. Bring the following:

1. Two transparent containers

2. Straw

3. Tape

4. Potato

B. Word Study:

1. Phase