• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Lab Report - In this lab report, it will describe the weight of the bob, the displacement and the length of the string of how each factor affect the period of a pendulum.

Extracts from this document...

Introduction

Lab 3 - Pendulum

Introduction:

The pendulum consists of a string that has something hanging from the end. When the pendulum is pulled back and release from a certain displacement, the pendulum will freely swing down to the opposite side by force of the gravity and back. The length of the pendulum is measured by the distance from the point where the string is attached and down to the top of the bob. The period is the time it takes for the string to complete a number of required cycles. The cycle is the motion of the bob from the start point to the extreme opposite and back. The bob is the mass of the end of the string. The displacement is the distance or angle the bob is pulled to the right. In this lab report, it will describe the weight of the bob, the displacement and the length of the string of how each factor affect the period of a pendulum. This includes the hypothesis, methods, control variable, results, data table and the conclusion for each experiment.

Apparatus:

• Stop watch ± 0.01 seconds
• Ruler ± 0.05 cm
• Protractor ± 0.5°
• Scale ± 0.05 grams
• Ring Stand with a ring clamp attached
• String
• 3 Rubber Stoppers (Bob)

Middle

Lab 1 Part 2 – To determine how the displacement affect the period of a pendulum.

Hypothesis:

As the displacement increases, the period of the pendulum to swing one whole cycle will increase. The reason which could make this hypothesis true is that increasing the displacement is similar to creating a longer distance for the pendulum to swing back and forth. Such as, walking 10 m and back will be longer than walking 5 m and back. Thus having the pendulum swing a higher distance will most likely increase the period of the pendulum.

Methods:

1. Obtain one rubber stopper (bob).
2. Determine the mass of bob using the scale that measures                         to the nearest 0.05 grams
3. Attach a string to the ring clamp.
4. Attach a meter stick to the ring stand such that the zero                         on the scale is aligned with the point where the string is                         attached.
5. Locate the 55 cm ± 0.05 on the scale of the ruler and                         attach the bob. Such that the top of the bob aligned with                         the point where it measures 55 cm ± 0.05.
6.         Remove the ruler.
7. Attach a protractor in front of the ring clamp such that the                         vertex is aligned with the point where the string is                                 attached.
8. Angle the string to 70° cm ± 0.5 by pulling by the bob.

Conclusion

Discussion:

After completing three experiments with all three factors, weight of the bob, the change of displacement and the length of the string affected the period of a pendulum. The time increased as both the displacement and length of string increased. Considering both factors caused the pendulum to travel a longer distance increasing the period. The only increasing factor that causes the pendulum’s period to decrease is the weight of the bob. As the mass of the bob increases the period of the pendulum decreases, by increasing gravitational force from the mass of bob. The following table on Lab 3 – part 1, 2 and 3 had one factor of either the weight of the bob, the displacement and the length of the string (the independent variables). The tables show that each factor had an effect of the pendulum’s period (the dependant variable).The results was, when increasing the two factors, displacement or length of string increase the period of a pendulum. However, when increasing the mass of the bob, the period of the pendulum decreases. Either way, all three factors, weight of the bob, the displacement, and the length of the string affect the period of a pendulum.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Fields & Forces essays

1.  ## The Compound Pendulum

5 star(s)

= 4?� k� + 4?� h� hg hg Multiplying through by h gives the initial equation in the form of y = mx + c: T�h = 4?� h� + 4?� k� g g Plotting T�h against h� will produce a straight line 'of which the gradient gives 4?�/g' 5.

2. ## Power Lab Report

Adair 833 2.34 2.66 2216 945 3 Sample Calculations: Analysis: The 5 most powerful: 1. Adam K. - tall, athletic, heavy, strong, fast 2. Adam R. - fast, short, agile 3. Ms. Adair - tall, athletic, heavy, strong, alert 4.

1. ## Experiment to determine gravity from a spring using analogue techniques

Spring 2 - Part 2 Mass Distance spring was extended 0.005 0.007 0.010 0.018 0.015 0.027 0.020 0.038 0.025 0.049 0.030 0.060 0.035 0.071 0.040 0.082 0.045 0.092 0.050 0.103 0.055 0.114 0.060 0.124 So the graph of extension against mass is: In the same was as for spring one,

2. ## Modeling a basketball shoot in the lab

The final position and velocity can then be obtained from their components. To find optimum angle for the maximum range, At top, vy = 0 vy = voy + gt = vo sin ? - gt total time = 2t Since Therefore, Maximum range is 45� since 2?

1. ## Sliding &amp;amp; Friction Lab Report

First, we taped down the pen as a barrier, so the block of wood would not fall off the table when it was sliding across the surface being tested. Then, we tied the string around the block of wood and attached the paperclip to the sting.

2. ## Investigation to determine the viscosity of glycerol.

through liquids. "Stokes law states that when a body is under free fall in a tube containing a liquid of infinite length there is a point when there is no more acceleration in the body and the body reaches terminal velocity.

1. ## Objective To find the acceleration due to gravity by means of a simple ...

to find the acceleration of free fall The slope of the graph = = 4.15ms-2 g = = 9.52 ms-2 Result with error and accuracy The graph is not precise enough. The best fit line may have deviation with the original plotted graph.

2. ## Determinating of acceleration due to gravity by timing a simple pendulum

* Timing should be aborted if the oscillation of the pendulum bob becomes elliptical. Explanation:As the bob must be swung in a vertical plane in order to obtain an accurate reading of corresponding period, if the oscillation of the pendulum bob becomes elliptical, the oscillation is not simple harmonic motion any more. • Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to 