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# Grade 10A - coulombs law lab activity - group2

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```Date: ……………. Task 1. V. Lab work: Chapter 6:
Teacher: Lubna Majd.
S (2).
Subject: Physics
Group:Horizontal
……2…………..projectiles
Grade 10Ad ( ….)
Objectives:
DEPARTMENT OF EDUCATION
AND KNOWLEDGE
Mlieh School C2, C3
Student names:
10
Students are going to:
1. Investigate the relation between different charges and the electrostatic
forces.
2. Study practically the effect of changing distance between charges on
the electrostatic forces.
3. Describe Coulomb’s Law.
A. Introduction:
You Learned that there is a repulsive force between the like charges,
while there is an attractive force between the unlike charges. The
question is how is it possible to calculate these forces? And what factors
are these forces depends on?
Electrostatic force (F) is :
the attractive or the repulsive force between charged objects.
q1
q1
repel
attract
q2
q2
q is the magnitude of the charge and it is measured in coulomb C.
Predict:
Write a prediction using the questions in the box below:
……………………………………………………………………………
……………………………………………………………………………
……………………………………………………………………………
1: What is the effect of changing the magnitude of the charges on the
electrostatic forces between the charges?
To test your hypothesis, follow the instructions below:
B. the effect of the magnitude of charges on the electrostatic forces:
➢ Click on the link below:
https://phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-law_en.html
➢ Run the lab by click on the picture.
➢ Adjust the position of the two charges as shown in the picture.
➢ Choose the magnitude of the charges as shown in the picture.
➢
➢
➢
➢
➢
Measure the force.
Write the type and magnitude of the force in the table below.
Fix the distance between charges to be 3cm.
Repeat the experiment by changing the value of q2 only.
Fill the tale below.
Table 1
The distance between the charges r =3cm
trail First Charge q1
&micro;C
Second charge
q2 (&micro;C)
1
-10
0
2
-10
-2
3
-10
-4
4
-10
-6
5
-10
-8
6
-10
-10
The Electrostatic
force between the
two charges: F(N)
Type of force
repulsive or
attractive force
➢ Draw a graph to represent the relation between the mass with the
C: Data analysis for part B:( 4marks)
1. Study the table. What happen to the
magnitude of F if one or both
charges q increase?
……………………………………
……………………………………
…………………………………….
2. Is your hypothesis correct?
Explain…………………………….
3. Look at the charge- electrostatic
force graph. Describe the relation
between the variables. (How F
force change as the charge
increase?)
F (N)
The charge- force graph
q2 (C)
…………………………………………………………………………
…………………………………………………………………………
4. If the force on q2 from q1 = 30N. How much the force on q1 from q2
will be? …………………………………………….……………
5. Describe mathematically the relation between force (F) and the
charges (q1 &amp;q2)
…………………………………………………………………………
…………………………………………………………………………
Skills
The effect of charges on F
Part B &amp;C
No.
part
Mark
✓ Able to use the tools in the simulation and control it
easily and correctly without teacher help.
1
✓ Choose the charges correctly.
1
✓ put the objects on the defined position.
1
✓ Measure F with high accuracy.
1
✓ Fill the table correctly with scientific notation.
3
✓ Draw the relation (f- q2) correctly with high precision.
3
✓ Discuss the results and reach to the right conclusion
about the relation between F and the charges. Q(1-5)
5
The deserved mark of 15
15
Selfevaluation
Teacher
Ev.
```