# Q3 W1 LAS GENERAL PHYSICS 2

```Republic of the Philippines
Department of Education
REGION VIII – EASTERN VISAYAS
SCHOOLS DIVISION OF LEYTE
BURAUEN COMPREHENSIVE NATIONAL HIGH SCHOOL
BURAUEN, LEYTE
SCHOOL ID: 303353
LEARNING ACTIVITY SHEETS (LAS) IN GENERAL PHYSICS 2
Activity Sheet in Grade 12, SY: 2020-2021
2nd Sem_Quarter 3: WEEK 1
Name of Learner:
Duration:
Time Started:
Teacher:
Time Ended:
Date:
Week/Day:
WEEK 1
Module 1: ELECTRIC CHARGES AND ELECTRIC FIELDS
Reference/s: DepEd-Division of Negros Oriental Self Learning Kit in General Physics 1
Learning Competency:
1. Describe using a diagram charging by rubbing and charging by induction STEM_GP12EM-IIIa-1;
2. Explain the role of electron transfer in electrostatic charging by rubbing STEM_GP12EMIIIa-2;
3. Describe experiments to show electrostatic charging by induction STEM_GP12EM-IIIa-3;
4. Calculate the net electric force on a point charge exerted by a system of point charges
STEM_GP12EM-IIIa-6;
5. Describe an electric field as a region in which an electric charge experiences a force
STEM_GP12EM-IIIa-7; and
6. Calculate the electric field due to a system of point charges using Coulomb’s law and the
superposition principle STEM_GP12EM-IIIa-10.
General Reminders: Use this activity sheet with care. USE THIS ACTIVITY SHEET IN
activity sheet to your teacher/ facilitator once you are through with it.
ACTIVITY 1: WATER BENDING
DIRECTIONS: This activity will help you acquire real-life concepts of static electricity. Make
a video of you doing the activity or pictures on an A4 bond paper featuring the materials
used, procedure and results. Submit it to your General Physics teacher.
MATERIALS YOU NEED: 3 Styrofoam cups (you can also use 2 paper cups and an inflated
balloon) and a toothpick. Also, this experiment will also require water and someone with dry
and clean hair.
1. Prepare the set-up by pushing the toothpick at the bottom side of the cups. Leave the
toothpick to produce a gentle drop of water after filling the cup. Hold the cup directly over
the second cup. Fill the cup (with a toothpick) with water and check if it is leaking steadily.
2. Observe the flow of water from the top cup to the cup below. What are your observations?
____________________________________________________
3. Rub the third cup on someone with dry hair several times. (This process will help you in
acquiring electrical charges).
4. Hold the cup (rubbed against dry hair) near the water stream without getting the cup wet.
What happened to the water flow? _____________________________________________________
Then, slowly move the cup away from the stream and observe. Did you observe changes?
___________
If
yes,
describe
the
change.
_____________________________________________________________________________________________
5. Try other objects (such as balloon, paper cup or any material) aside from the Styrofoam cup and
rub it on a dry and clear hair. What objects have you tried? _____________________________Which of
the
objects
have
changed
the
flow
of
water?
__________________________________________________________________________________________________
Address: Sto. Ni&ntilde;o St., San Diego District IX, Burauen, Leyte 6516
1
Republic of the Philippines
Department of Education
REGION VIII – EASTERN VISAYAS
SCHOOLS DIVISION OF LEYTE
BURAUEN COMPREHENSIVE NATIONAL HIGH SCHOOL
BURAUEN, LEYTE
SCHOOL ID: 303353
ACTIVITY 2: QUANTITATIVE PROBLEMS
below. Use another sheet of paper if needed, attach it here in your LAS.
Three charged spheres are at the positions shown in the figure.
(a) Find the net electrostatic force at sphere B.
(b) Find the net electric field at (4, -3)
(a) Find the net electrostatic force at sphere B.
A What is/are given?
C
Are the units
consistent with the
formula?
D How would you draw
the problem?
E
What strategy must
be employed?
F
Solution
G What is the
conclusion?
Address: Sto. Ni&ntilde;o St., San Diego District IX, Burauen, Leyte 6516
2
Republic of the Philippines
Department of Education
REGION VIII – EASTERN VISAYAS
SCHOOLS DIVISION OF LEYTE
BURAUEN COMPREHENSIVE NATIONAL HIGH SCHOOL
BURAUEN, LEYTE
SCHOOL ID: 303353
(b) Find the net electric field at (4, -3)
A What is/are given?
C
Are the units
consistent with the
formula?
D How would you draw
the problem?
E
What strategy must
be employed?
F
Solution
G What is the
conclusion?
ASSESSMENT
DIRECTIONS: Read each sentences carefully. Write the letter of your choice in the space
provided.
______1.The diagram below shows the behavior of the electroscope before and after a
positively charged rod is placed near the electroscope knob. This tells us that the
movement of electrons is from ______.
Address: Sto. Ni&ntilde;o St., San Diego District IX, Burauen, Leyte 6516
3
Republic of the Philippines
Department of Education
REGION VIII – EASTERN VISAYAS
SCHOOLS DIVISION OF LEYTE
BURAUEN COMPREHENSIVE NATIONAL HIGH SCHOOL
BURAUEN, LEYTE
SCHOOL ID: 303353
a.rod to leaves
c.knob to leaves, then back to knob
b.leaves to knob
d.leaves to knob, then back to leaves
_____2.A glass rod was positively charged when rubbed with a silk cloth. The net positive
charge is accumulated because the glass rod
a.loses protons
c.gains electrons
b.loses electrons
d.loses electrons
_____3.Gravitational forces and electric forces are both
a.forces with attractive and repulsive behaviors
b.indirectly proportional to the square root of separation between bodies
c.directly proportional to the product of the masses and charges
d.decreasing when the distance between two bodies is decreasing
_____4.At which point is the electric field strength strongest?
D
A
C
B
_____5.Three spheres were brought together. When Spheres A and B are brought together,
they attract. When spheres B and C are brought together, they also repel. Which of the
following is true?
a.Spheres A &amp; C have same signs
c.Spheres A &amp; C have opposite signs
b.Spheres B &amp; C have same signs
d.Spheres A &amp; B have similar signs
_____6.The first object has a charge of +3nC, and the second object has a charge of 6 nC.
Which is true about the electric forces between these objects?
a.F1on2= 2F2on1
b.3F1on2= 6F2on1
c.-6F1on2=2F2on1
d.F1on2=F2on1
For Nos. 7 to 9, refer to the diagram below:
_____7. A positively charged rod was brought near to a metallic plate; what is the type of
charge induced along the side facing the rod?
a.positive
b.negative
c.netural
d.depends on number of charges
_____8.If the positively charged rod was touched on the neutral metallic plate, what is the
charge of the plate?
a.same
b.negative
c.positive
d.depends on number of charges
_____9.After the positively charged rod is placed near the plate, a grounded wire was
attached. What is the charge of the plate after the wire is removed?
a.negative
b.positive
c.neutral
Address: Sto. Ni&ntilde;o St., San Diego District IX, Burauen, Leyte 6516
d.depends on number of charges
4
Republic of the Philippines
Department of Education
REGION VIII – EASTERN VISAYAS
SCHOOLS DIVISION OF LEYTE
BURAUEN COMPREHENSIVE NATIONAL HIGH SCHOOL
BURAUEN, LEYTE
SCHOOL ID: 303353
η
_____10.The electric flux through the surface at the right is ____
a.zero
c.positive
b.negative
d.unknown
_____11.A test charge produced an electric field, E, at point 3 m away from the charge. The
point where the field is half its original values is located at
a.1.5 m from the charge
c.4.5 m from the charge
b.6 m from the charge
d.at the point of charge
_____12.The electric field of a body is directly related to its
a.momentum
b.kinetic energy
c.potential energy
d.charge it carries
_____13.Charge q1 (26.0 &micro;C) and q2 (-47.0 &micro;C) experienced an electrostatic force of 5.70
N between them at a distance of ____
a.1.39 m
b.1.93 m
c.2.14 x 10-19
d.1.464 x 10-8
_____14.How many electrons have been removed from a positively charged particle if it has a
net charge of 5 x 10-9 C?
a.5 x 10-9 electrons
c.1 x 10-8 electrons
b.2.5 x 10-9 electrons
d.incomplete information
_____15.A sphere of radius 0.05 m has a charge of 2.0 nC. The charge is said to be located at
the center of the sphere. The magnitude of electric field inside the surface is
a.zero
c.thrice the original value
b.twice the original value
d.half the original value
Prepared by:
JUNEDINE MITZE P. QUI&Ntilde;ONES
Teacher II
QUALITY ASSURANCE TEAM IN SCIENCE
MARIE CHARISSE B. GENISTON
Teacher II / Member
JUNEDINE MITZE P. QUI&Ntilde;ONES
Teacher II / Member
SHIELA MANGALLON
Teacher II / Chairperson