discussion

4. REVIEW

5. What measurement is used to
measure wavelength?
A. Hertz
B. Grams
C. Meters
D. Seconds

6. In an electromagnetic spectrum colors are
arranged in sequence according to its
wavelengths. What color has the longest
wavelength?
A. Blue
B. Green
C. Orange
D. Red

7. In an electromagnetic spectrum colors are
arranged in sequence according to its
wavelengths. What color has the shortest
wavelength?
A. Blue
B. Green
C. violet
D. Red

8. Select the correct order of colors on the
Electromagnetic Spectrum according to
increasing frequency?
A. Violet, Green, Blue
B. Yellow, Green, Blue
C. Orange, Indigo, Red
D. Blue, Orange, Violet

9. How would you compare the wavelengths
of red and violet?
A. Red has longer wavelength than violet
B. Violet has longer wavelength than red
C. Both have the same wavelength
D. Cannot be determined

10. Class, this time we will have an activity. This activity is
entitled “PICTOWORD”. This is the mechanics of the
game.
1.All you have to do is to guess the hidden word based on
the picture plus/minus letters being shown in the
screen.
2.You will be given 10 seconds to guess the word then
after 10 seconds you will be going to give your answer.
3.Each correct answer will correspond to 2 points in your
performance task.

11. + ION =
CONDUCTION

12. -X + -A =
CONVECTION

13. -ES + ION =
RADIATION

14. H + =
HEAT

15. + =
HEAT TRANSFER

16. HEAT TRANSFER

17. UNLOCKING OF DIFFICULTIES
Heat is a thermal energy that is in transit.
Heat transfer is the movement of thermal energy (total energy of all
particles in an object) from matter at a higher temperature to matter at a
lower temperature.
Temperature refers to the relative hotness or coldness of an object.
Conduction is a mode of heat transfer that occurs due to the vibrating and
colliding particles of objects that are in contact.
Convection is a mode of heat transfer that takes place in fluids because
their particles can move around.
Radiation is a mode of heat transfer that does not need particles or a
medium to take place.

18. What is heat?

19. What is heat?
Heat is a form of energy that refers to the
thermal energy that is in the process of being
transferred, due to the difference in their
temperature. In other words, heat is energy “in
transit”. It transfers from an object of higher
temperature to an object of lower temperature.
Heat is measured in joules (J).

20. What is temperature?

21. What is temperature?
Temperature is a measure of how hot or
cold a substance feels, and it is
measured in degrees Celsius (°C).
Temperature is a measure of the average
kinetic energy of the particles in an
object or system. We use a thermometer
to measure the temperature of an object
or substance.

22. What is heat
transfer?

23. What is heat transfer?
Heat transfer is a phenomenon
related to a change in temperature
or a change in the relative hotness
or coldness of an object. Energy
transfers naturally flow from a body
of higher temperature to a body of
lower temperature.

24. What are the mode of
heat transfer?

25. The mode of heat transfer
CONDUCTION
RADIATION
CONVECTION

26. What is conduction?

27. What is conduction?
Conduction is a mode of
heat transfer that occurs
due to the vibrating and
colliding particles of
objects that are in contact.

28. Differentiate thermal conductor and thermal
insulator and give example.

29. What is thermal conductor?
Materials that allow heat to pass through them
easily are called thermal conductors. Metals, such
as aluminum, copper, steel, and iron, are all good
thermal conductors. Thermal conductors can be
useful when it is necessary to cool things down, or
heat them up, quickly. A metal saucepan, for
example, allows heat to transfer quickly to the food
inside it.

31. What is thermal insulator?
Materials that prevent heat from passing through
them are called thermal insulators. A good thermal
insulator will keep cold objects cold for a long time,
and hot objects hot. Wood, plastic, and many
fabrics, such as wool and cotton, are good thermal
insulators. Thermal insulators are good materials for
keeping people warm. Clothing, carpets, and
curtains are examples of everyday thermal
insulators.

33. One basis for determining the use of
materials is by their ability to
conduct heat, known as their
conductivity. Higher conductivity
means that the material is a good
conductor of heat. Metals have
higher conductivities; they are good
conductors of heat.

34. Describe the difference between
conductor and convection.

35. Convection is a mode of heat transfer that takes place
in fluids and gases because their particles can move
around. The substance of the liquid or gas moves to
carry the heat. This happens because of the movement
of particles in a fluid. Liquids and gases transfer hat
mainly by convection. Liquids and gases become
lighter when they are heated. This causes the heated
part to rise. Cooler liquids or gases come in from the
side to take its place. The heated substance cools as it
rises away from the heat source. When is cools it sinks
back down again. This leads to a circulation of the
substance that is called the convection current.

37. How does radiation differ
from conductor and
convection?

38. The heat from the sun travels by waves through space
towards the Earth, which will absorb the heat, so the
Earth becomes warm. This process is called radiation.
Radiation is a mode of heat transfer that does not
need particles or a medium to take place. It is the
transfer of heat in rays, from a hot object, without
needing a medium to pass through. It travels in all
directions from a hot object. The hotter an object is,
the more heat it will radiate out. Radiation travels in a
straight line and can travel in a vacuum. It does not
need particles for it to travel.
RADIATION

40. Based in our discussion, analyze the pictures and
determine the mode of heat transfer and explain.

42. ORAL RECITATTION
Directions: Choose
the letter of the
correct answer.

43. The illustration on the right shows a
lady making a noodle soup using a
pan made of metal. Use this
illustration to answer the questions
below:
1. How does heat travel through the
pan?
A. by radiation
B. by dispersion
C. by convection
D. by conduction

44. The illustration on the right shows a
lady making a noodle soup using a pan
made of metal. Use this illustration to
answer the questions below:
2. How does heat travel through
the soup?
A.by radiation
B.by dispersion
C.by convection
D.by conduction

45. 3. In what direction
does heat travel through
the soup?
A. from top to bottom
B. from bottom to top
C. both A and B
D. neither A nor B

46. 4. Which of the following explains why the lady
is able to hold the handle of the pan with her
bare hands?
I. The handle is made of good insulator of heat.
II. The handle has low thermal conductivity.
III. The handle has high thermal expansion.
A. I and II only
B. II and III only
C. I and III only
D. I, II, and III

47. 5. Which of the following
methods of heat transfer is
NOT taking place in the
given situation?
A. Conduction
B. Radiation
C. Convection
D.None of them