SCIENCE 5
QUARTER 3 WEEK 4
Review:
HEAT TRANSFER
Conduction, heat is transferred from hotter to colder objects and they must be in direct contact
or touching each other. In terms of medium of transfer, materials that are involved in conduction
are generally in solid form. Two classification of solid materials, Conductors & Insulators
Conductors
 Materials that allow heat and
 electricity to pass through them.
 Most materials that conduct heat are metals because their electrons can flow easily.
Insulators
 Materials that do not transfer electricity.
 The electrons of the insulators are not free flowing for they are tightly bonded with its atom.
Conductivity depends on
 Thickness-the thicker, the better the conduct
 Size-the shorter the size, the better the conductor
 Temperature-with increase in temperature, electrons gain energy causing better conductivity
Other ways of heat transfer include convection and radiation. Convection is the transfer of heat
from one place to another by the movement of fluids. For example, when a pot of water is heated,
water begins to rise. As the water rises, cold water goes down. The process is repeated until all
the water has the same temperature.
Radiation is the transfer of heat through empty space. Example is standing before a stove,
where your body feels the heat from it.
Materials that Transmit, Absorb or Block Light
The following characteristics of materials can affect the behavior of light.
1. Transparent- materials that allows light to pass through
2. Translucent- it absorbs and scatter lights on the materials. It transmits a little light
and absorbs it. Objects on the opposite sides appear blurred.
3. Opaque- does not allow the light to pass through, Light is reflected or block by the
object.
NEW LESSON:
ELECTRICITY
Electricity can be more useful if it can be controlled. You should be able to make
electricity flow when you need it and stop its flow when you no longer need it. It can flow
through wires to places where it is needed. Electricity that flows is current electricity.
Static electricity is produced when:
a. Electrons are transferred from one object to another due to friction; And
b. Opposite charges are built between two objects that are placed near each other.
Static electricity is produced by rubbing. Static electricity is not useful it does not flow
and cannot be controlled. For instance, energy in a lightning flash is beyond control. Static
electricity cannot light a bulb or make an electric fan work
DO THIS EXPERIMENT AND ANSWER THE GUIDE QUESTION AFTER
Activity No. 1
Objectives:
1. Demonstrate how static electricity is produced.
2. Describe how you can make an inflated balloon stick to the wall.
What you need:
Woolen cloth
Inflated balloon
What to do!
Describe how you can make an inflated balloon stick on the wall (you are free to use any
of the materials you have used earlier aside from the materials given. Explore and try various
combinations and ways to try to stick the balloon on the wall. Experiment )
Answer the Guide Questions:
1. What did you do to stick the inflated balloon to the wall?
2. What did your observation prove?
3. What kind of electricity was produced?
4. Why do you think are the effects of static electricity more observable in the hot months than
in cold months?