1. Imam Mohammed bin Saud University Science Collage
General Physics
Lab Manual
Physics Lab Science Collage-Imam University

2. Physics 101 Lab
General physics course is mainly about mechanics and electricity. You will perform basic physics experiments.
Hope you enjoy your physics lab ….
Physics Lab Science Collage-Imam University

3. Lab Rules All students must attend the lab section.
No food. No drinks.
The lab must be clean at all time.
Ask your teacher to check all electrical circuits before turning on the power supply.
Before making any adjustments on your electrical circuit make sure it is turned off.
At the end of each lab switch off and unplug any electrical equipment and disconnect all circuits and arrange all equipment tidily on the bench.
Lab reports must be submitted in a week’s time.
Lab reports writing must be an individual effort although the experiments will be performed in groups.
The lab is worth 20% of the course’s grade.
A missed lab will receive a zero grade.
A make up lab must be performed during the same week of the missed lab if your instructor accepts your excuse.
Physics Lab Science Collage-Imam University

4. Lab report guide Your lab report should consist of: Title Page:
The following information must appear all by itself on the first page:
the title of the experiment
your name
the names of your partners, if any
the performance date
the course and section numbers
the name of your Lab Instructor
Introduction:
Objective, method and results.
Experimental procedure:
Description of apparatus and outline of technique.
Discussion: Here you present your data, explain how you reduced your data to a value for the OBJECTIVE, and reflect on the reliability of your result.
Data summary: Present the collected raw data here, in tabular form. Any graphs you created should be included in this section, also. Graphs should be drawn on special graphing paper with appropriate scaling. Graphs, tables and figures must have legible titles and captions.
Physics Lab Science Collage-Imam University

5. Lab report guide
Analysis: Describe, in one paragraph, the mathematical steps used to convert the raw data into the final value reported for the objective.
Errors: In a single paragraph comment on the accuracy and precision of the apparatus and include a discussion of the experimental errors and an estimate of the error in your final result.
The two principal sources or error are:
Physical phenomena similar to the phenomena being measured that affect the measured quantity (e.g., stray magnetic or electric fields, unaccounted for friction).
Limitations of the observer, the analysis and/or the instruments.
Conclusion: Restate your results, including the uncertainty in any numerical results. Compare your result with the accepted value.
Appendices: Include here the answers to questions assigned from the lab manual. They should be answered in complete sentences using appropriate scientific terminology.
Physics Lab Science Collage-Imam University

6. Experiment 1 Balancing force (force table)
Objective:
Using the force table to experimentally find the balancing force of two forces.
Theory:
Forces are vector quantities which have both magnitudes and directions.
An object with different forces acting on it is considered in equilibrium when the vector sum of all individual forces acting on it is zero, or in other words when the resultant force acting on the object is equal to zero.
Physics Lab Science Collage-Imam University
Science Collage-Imam University

7. Experiment 1 Continued
An object moving as a result of different forces can be balanced by an equilibrant force which is equal and opposite of the resultant force of all forces acting on it. Where FR is the resultant force and FE is the equilibrant force.
Physics Lab Science Collage-Imam University
Science Collage-Imam University

8. Experiment 1 Continued
There are two methods to fond the resultant force of two forces graphically: 1- Tip to Tail Method: We can add any two forces, F1 and F2, by placing the tail of F2 so that it meets the tip of F1. The sum, F1 + F2, is the vector from the tail of F1 to the tip of F2. Note that you’ll get the same vector if you place the tip of F2 against the tail of F1. In other words, F1 + F2 and F2 + F1 are equivalent. F2 F1 FR
Physics Lab Science Collage-Imam University
Science Collage-Imam University

9. Experiment 1 Continued
2- Parallelogram Method: To add F1 and F2 using the parallelogram method, place the tail of F2 so that it meets the tail of F1. Take these two forces to be the first two adjacent sides of a parallelogram, and draw in the remaining two sides. The vector sum, F1 + F2, extends from the tails of F1 and F2 across the diagonal to the opposite corner of the parallelogram. F1 FR F2
Physics Lab Science Collage-Imam University
Science Collage-Imam University

10. Experiment 1 Continued Equipment:
Force table – stand base – pulleys – hangers – weights (slotted masses) – strings – center ring – protractor .
Physics Lab Science Collage-Imam University

11. Experiment 1 Continued
The force table is a circular table that has the angles 0 degrees to 360 degrees inscribed on the edge.
Pulleys are placed at different angles with strings attached to a center ring running over the pulleys. Masses are placed on mass hangers attached to the end of the strings to provide the forces needed.
By adding the vectors (applied forces), the resultant vector is found. To balance the force table, a force that is equal in magnitude and opposite in direction must counterbalance the resultant. This force is the equilibrant force.
Physics Lab Science Collage-Imam University
Science Collage-Imam University

12. Experiment 1 Continued Procedure:
1- Your lab instructor will provide you with two different forces (magnitude and direction). Attach suitable slotted masses with the thin strings to the center ring of the force table.
Remember that:
F1=M1g and F2=M2g where g=9.8 m/s2 which is the gravitational acceleration.
2- Consider the direction of each force which is represented by the angle. The force table’s edge will help you identify the angle accurately.
3- In order to balance the ring; a third force should be attached.
Physics Lab Science Collage-Imam University

13. Experiment 1 Continued
4- Record the magnitude and direction of the equilibrium force. 5- Plot both original forces on graphing paper by setting a drawing scale (1 cm = 1 N). 6- Find the resultant force graphically. The magnitude of the force is represented by the length of the vector and should be converted using the scale you have chosen. The direction is represented by the angle which you can measure using the protractor. 7- Now find the equilibrant force which is equal and opposite to the resultant force. 8- Record all values in the following table. 9- Find the percentage error.
Physics Lab Science Collage-Imam University

14. Experiment 1 Continued Data: Percentage Error: Percentage error
Balancing force
Force 2
Force 1
experimentally
graphically
Magnitude
Angle
Physics Lab Science Collage-Imam University

15. Experiment 2 Acceleration of Linear uniform motion
Objective:
To calculate the acceleration of an object moving in a straight line with a constant acceleration using equations of motion.
Theory:
Equations of motion are used to study the linear motion of a uniformly accelerated body.
where:
Displacement or change in position d:
Original velocity, the velocity at the start of the acceleration
vo:
Final velocity, the velocity at the end of the acceleration.
vf:
Acceleration, this is a constant acceleration a:
Time, this is the time period of the acceleration. t:
Physics Lab Science Collage-Imam University
Science Collage-Imam University

16. Experiment 2 Continued Equipment:
Track – trolley – holding magnet – electronic stop clock – light barrier – pulley – mass hanger – slotted weights – cables.
Physics Lab Science Collage-Imam University

17. Experiment 2 Continued Procedure:
1- Set the equipment, use the cable to connect the trolley with the pulley and the hanging mass.
2- You can perform this experiment by using either one or two light barriers.
3- If you are using a holding magnet and one light barrier. Connect the holding magnet to the stop clock and adjust the voltage so that the trolley is held.
4- Put the light barrier at a certain distance.
5- Release the trolley by stopping the magnet and record the time the trolley took to pass the light barrier.
6- Repeat and record the time three times then calculate the average time and the final velocity.
7- Change the distance and repeat the previous steps for each distance.
8- If you are using two light barriers, place each barrier at certain distance and hold the cart at the first barrier then release it and record the time.
Physics Lab Science Collage-Imam University

18. Experiment 2 Continued
9- Repeat and record the time three times then calculate the average time and the final velocity. 10- Change the distance and repeat the previous steps for each distance. 11- Whether you used one or two light barriers, tabulate your data.
Final Velocity Square
m2/s2
Final Velocity
m/s
Time square s2
Average Time s
Time 3
Time 2
Time 1
Distance m
Physics Lab Science Collage-Imam University

19. Experiment 2 Continued
12- Plot three different graphs; a graph between the square time (x-axis) and the distance (y-axis) or displacement traveled by the trolley. And a graph between the time (x-axis) and the final velocity (y-axis). And another graph between the distance (x-axis) and the final velocity square (y-axis). 13- Draw the best line and find its slope at each graph. 14- Calculate the acceleration from each slope using equations of motion. 15- Find the real value of the carts acceleration using Newton’s second law which states that the force is proportional to the acceleration. F=ma where F could be found from the mass causing the motion of the cart. 16- Find the percentage error of the acceleration.
Physics Lab Science Collage-Imam University

20. Experiment 3 Free fall Objective:
To calculate the gravitational acceleration of free falling ball.
Theory:
Under free fall all objects have the same constant acceleration, which in metric system is equal to 9.8 m/s2 at sea level. Equations that describe free fall are:
where:
Vertical displacement
Δy:
Original velocity, the velocity at the start of the acceleration
vo:
Final velocity, the velocity at the end of the acceleration.
vf:
Acceleration due to gravity g:
Time, this is the time period of the acceleration. t:
Physics Lab Science Collage-Imam University
Science Collage-Imam University

21. Experiment 3 Continued Equipment:
Steel ball – contact plate – holding magnet – holding magnet adapter with a release mechanism – electronic stop clock – stand base – rods – scale – connecting leads.
Physics Lab Science Collage-Imam University

22. Experiment 3 Continued Procedure:
1- Set the equipment and hold the steel ball using the holding magnet at a certain height.
2- Release the ball and read the time the ball took traveling the vertical distance, then reset the stop clock and reattach the ball and read the time again , you should take three readings of the time then find the average time the ball has traveled.
3- Reduce the height and repeat the previous steps.
4- Tabulate your data.
Time square s2
Average Time s
Time 3
Time 2
Time 1
Height m
Physics Lab Science Collage-Imam University

23. Experiment 3 Continued
5- Plot a graph between the square time (x-axis) and the height (y-axis) or displacement of ball. 6- Draw the best line and find its slope. 7- Calculate the gravitational acceleration from the slope using equations of free fall. 8- Find the percentage error. 9- Repeat the previous steps using a different mass ball. 10- State your observation
Physics Lab Science Collage-Imam University