DEPARTMENT OF EDUCATION
Region VII, Central Visayas
DIVISION OF CEBU PROVINCE
NANGKA NATIONAL HIGH SCHOOL
Purok 4 Nangka, Consolacion, Cebu
Name: ______________________________________
Date Submitted:______________________________
Grade and Section:_________________
Score:____________________________
Activity 3.7.A
The Mystery of the Plastic Comb
Worksheet
One day, after Andres combed his hair using a plastic comb, he accidentally placed the plastic comb near a paper doll
that was cut by her sister Mela. Both were surprised on what happened next.
Guide Questions:
1. How did the plastic comb attract the doll?
The plastic bomb attracts the paper doll because it became electrically charged.
2. What happened to the plastic comb? Paper doll?
The plastic comb gained charges and the paper doll gained charges from the plastic comb.
DEPARTMENT OF EDUCATION
Region VII, Central Visayas
DIVISION OF CEBU PROVINCE
NANGKA NATIONAL HIGH SCHOOL
Purok 4 Nangka, Consolacion, Cebu
Name: ______________________________________
Date Submitted:______________________________
Grade and Section:_________________
Score:____________________________
Experiment 3.7.A
Charge to Experience
Objectives:
After performing this activity, you will be able to charge materials by friction.
Materials:
 Plastic cover
 Tissue paper
 Paper
 Scissors
Procedure:
1. Cut small strips of paper.
2. Rub the small tissue paper against a plastic cover.
3. Place the rubbed plastic cover above the bits of paper.
4. Remove the bits of paper wiping the plastic cover with tissue.
5. Repeat the procedure twice and record your observation.
6. After, tap the plastic cover with your bare hands.
7. Place the plastic cover again over the bits of paper and observe.
Guide Questions:
Q1. What happens when the plastic cover is placed above the bits of paper?
The bits of paper were attracted to the plastic cover
Q2. Is there any interaction between the paper and plastic cover?
Yes, the paper was attracted to the plastic cover
Q3. Does the rubbing of tissue paper cause the attraction between paper and plastic cover? How?
Yes, the rubbing of tissue cause the plastic cover to be charged
Q4. What happened after you tapped the plastic cover with your bare hands and placed it over the bits of paper
again?
The bits of paper were not attracted to the plastic cover anymore
Q5. Is there still attraction between the paper and plastic cover?
none
DEPARTMENT OF EDUCATION
Region VII, Central Visayas
DIVISION OF CEBU PROVINCE
NANGKA NATIONAL HIGH SCHOOL
Purok 4 Nangka, Consolacion, Cebu
Name: ______________________________________
Date Submitted:______________________________
Rubrics
Grade and Section:_________________
Score:____________________________
DEPARTMENT OF EDUCATION
Region VII, Central Visayas
DIVISION OF CEBU PROVINCE
NANGKA NATIONAL HIGH SCHOOL
Purok 4 Nangka, Consolacion, Cebu
Name: ______________________________________
Date Submitted:______________________________
Grade and Section:_________________
Score:____________________________
Experiment 3.7.A
Pass the Charge
Objectives:
After performing this activity, you should be able to charge a material by induction and conduction
SET UP A
Materials:
 A jar with plastic lid
 Copper wire
 Plastic straw
 2 small pieces of aluminum foil
 Electrical tape
 Plastic cover
 Tissue paper
Procedure:
1. Punch a hole at the center of the jar cover.
2. Take the copper wire and slide through the plastic straw and make a little hook at the bottom end of the
copper wire.
3. Put the 2 pieces of foil on the hook one after the other using the hole you made on each of the pieces of foil.
The 2 pieces of foil should now be touching together at the end of the hook.
4. Take the plastic lid and put it on top of the jar and secure it with some electrical tape to make sure the lid is
firmly fixed on the top of the jar.
5. Rub a tissue aper against a piece of plastic paper cover.
6. Bring the plastic cover close to the copper wire without them touching each other.
7. Record your observation.
Guide Questions:
Q4. Were you able to charge the copper wire? Explain how this happened.
Yes, it happened when the plastic cover was placed near but not touching the copper wire. Bringing the
charged plastic cover nearby the copper wire will cause charge movement and separation in the copper wire.
Q5. Is it necessary for the plastic cover and copper wire to come in contact for charging to happen? Why or why not?
No, charging can also happen without contact by bringing a charged object (plastic cover) nearby a neutral
object (copper wire).
SET B
Procedure:
1. Repeat all steps in Set up A except Step 6
2. Touch the tip of the copper wire after 1 minute.
3. Record your observation.
Guide Questions:
Q6. What do you think is the charge acquired by the plastic cover after rubbing it against the tissue paper?
The tissue paper will lose electrons; thus, the plastic cover will acquire a negative charge.
Q7. What causes the pushing of the aluminum foil apart?
When you rub a tissue paper against a piece of plastic cover, electrons from the tissue paper will get
transferred to the plastic cover, electrons from the tissue paper will get transferred to the plastic cover which
means that the plastic cover will become more negative (or negatively charged) and the tissue paper will
become more positive.
When you move the plastic cover closer to the copper wire, this will cause the electrons that are on the
piece of copper to move down the tube and away from the plastic cover because similar charges repel each
other.
When the electrons are pushed down the copper wire, they will be transferred down into the hook and into
the hook and into the pieces of foil.
At this stage, both pieces of aluminum foil have become negatively charge and since negative charges repel
negative charges, this explains why the 2 aluminum pieces spread apart.
Q8. What is the purpose of touching the plastic cover in step no. 2?
When the negatively charged copper wire is touched, its charge becomes grounded (neutralized). The
positively charged protons enter the copper wire and neutralize the negative charge.
Q9. What is the charge acquired by the copper wire after a charged plastic cover was brought into contact with it?
After a finger touched it?
The copper wire acquired a net negative charge when a charged plastic cover was brought into contact with
it. After touching it with a finger, the copper wire became grounded or neutral
The teacher will post a picture of atom. She will then ask the following questions:
1. What is the smallest unit of matter? what is its basic particles?
2. Which subatomic particle is positively charged? negatively charge? no charge at all?
3. Which subatomic particle can be transferred or gained by objects? Why?
4. What happens when an object loses an electron? gains an electron? neither lose or gain electrons?
The process of supplying the electric charge (electrons) to an object or losing the electric charge (electrons)
from an object is called charging. An uncharged object can be charged in different ways.
The teacher will then introduce charging by friction by showing the setup in the previous experiment to the class.
5. In the experiment, which material lost electrons? gained electrons? Why?
6. Why did the pieces of paper stick to the plastic cover?
7. What caused this to happen?
Charging by friction is a process that involves the rubbing of one material on another material resulting in the
electrons moving from one object to another.
7. How do we know whether a material gains or lose electrons?
Triboelectric series
It is a list that ranks materials according to their tendency to gain or lose electrons and how they develop a charge
relative to other materials.
Law of conservation of charges
It state that charges cannot be created nor be destroyed, but can be transferred from one material to another. Thus,
the total charge in a system remains constant.
Quiz
Directions: Choose the best answer.
1. Which process refers to the transfer of charge between objects by rubbing?
a. Charging by conduction
c. charging by induction
b. Charging by friction
d. charging
2. How does an object become negatively charged?
a. By losing protons
c. Gaining electrons
b. By losing electrons
d. Gaining protons
3. If you rub a glass rod with a piece of silk, the rod becomes positively charged. What does this mean?
a. friction destroyed electrons in rod
c. the silk has become negatively charge
b. protons have moved to the rod
d. glass attracts more protons
4. If a substance has a higher number of electrons than protons on its surface, what type of charge does it
have?
a. A neutral charge
c. a negative charge
b. No charge at all
d. a positive charge
5. Which object CANNOT be charged by friction?
a. Plastic comb
c. rubber balloon
b. Copper rod
d. woolen cloth
DEPARTMENT OF EDUCATION
Region VII, Central Visayas
DIVISION OF CEBU PROVINCE
NANGKA NATIONAL HIGH SCHOOL
Purok 4 Nangka, Consolacion, Cebu
Name: ______________________________________
Date Submitted:______________________________
Grade and Section:_________________
Score:____________________________
Experiment 3.7.A
Charge to Experience
Objectives:
After performing this activity, you will be able to charge materials by friction.
Materials:
 Plastic cover
 Tissue paper
 Paper
 Scissors
Procedure:
8. Cut small strips of paper.
9. Rub the small tissue paper against a plastic cover.
10. Place the rubbed plastic cover above the bits of paper.
11. Remove the bits of paper wiping the plastic cover with tissue.
12. Repeat the procedure twice and record your observation.
13. After, tap the plastic cover with your bare hands.
14. Place the plastic cover again over the bits of paper and observe.
Guide Questions:
Q1. What happens when the plastic cover is placed above the bits of paper?
Q2. Is there any interaction between the paper and plastic cover?
Q3. Does the rubbing of tissue paper cause the attraction between paper and plastic cover? How?
Q4. What happened after you tapped the plastic cover with your bare hands and placed it over the bits of paper
again?
Q5. Is there still attraction between the paper and plastic cover?