# Pendulum Report

Topics: Pendulum, Orders of magnitude, Pendulum clock Pages: 7 (924 words) Published: August 31, 2010
What Factors Affect the Period of a Pendulum?

Introduction

In this experiment, my group will find out what are the factors that affect the period of a pendulum. In this report, I will personally explain the aim of the experiment, the hypothesis of my group, the variables, the apparatus, method, data, data analysis, evaluation and last but not least the conclusion.

Aim

To find out whether the heavy or light pendulum will affect the period as well as the string’s length

Hypothesis

We think that the heavier weight of the pendulum and the short string will increase the period. The length of the string affects the pendulum swing because the longer the string, the farther the pendulum will swing. By having a short string, it makes the pendulum swings faster. The heavier weight will also affect the pendulum because the heavier the weight, the faster the pendulum will swing because it will not swing too high. If the pendulum is light, it will be easier to be blown away. So, it will make the period longer.

Variable

- Independent -> Weight given on each pendulum

- Dependent -> The period of the pendulum

- Control -> Height of the clam stand, applied force, length of the string, position of the experiment, same type of weight hanger, height of releasing point

Apparatus

- Weight

- String

- Clampstand

- Stopw atch

- Ruler

- Scissors

- Weight hanger

- Protractor

Method

Experiment by different weight of the pendulum

1. Prepare all the apparatus

2. Put the weight into the weight hanger (220 gr, 170 gr, 120 gr)

3. Measure the length of the string (25 cm)

4. Tie the string with the weight hanger (220gr) and the clampstand

5. Place the pendulum 90° from the clampstand

6. Release the pendulum while others will count the time of one period by the stopwatch

7. Write the result of the time of one period

8. Tie the string with the weight hanger (170gr) and the clampstand

9. Repeat No. 5 – No.7

10. Tie the string with the weight hanger (120gr) and the clampstand

11. Repeat No.5 – No.7

Experiment by different length of the string

1. Prepare all the apparatus

2. Put the weight into the weight hanger (200 gr)

3. Measure the length of the string (20 cm, 15 cm, 10 cm)

4. Tie the 20cm string with the weight hanger and the clampstand

5. Place the pendulum 90° from the clampstand

6. Release the pendulum while others will count the time of one period by the stopwatch

7. Write the result of the time of one period

8. Tie the 15cm string with the weight hanger and the clampstand

9. Repeat No.5-No.7

10. Tie the 10cm string with the weight hanger and the clampstand

11. Repeat No.5-No.7

Data

Mass Graph

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0 120 170 220

Note: Length of the string is 25 cm

Length Graph

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0 10 15 20

Note: Weight of the load is 200 grams

Data Table

Table of Different Mass

220 grams170 grams120 grams

1st 1.5 seconds1.2 seconds0.7 second

2nd2 seconds1 second1 second

3rd1.7 seconds1.2 seconds0.9 second

Ave1.73 seconds1.13 seconds0.85 second

Table of Different Length

25 cm15 cm10 cm

1st 1.5 seconds1 second0.6 second

2nd0.8 second1.2 seconds0.6 second

3rd1 second1.1 seconds1 second

Ave1.1 seconds1.1 seconds0.73 second

Data Analysis

From the data, we learned that the string really affects the pendulum. The longer string has fewer periods than the shorter one because the longer the string, the farther the pendulum...