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

# Investigating pendulums.

Extracts from this document...

Introduction

## Investigating pendulums

### Plan

A pendulum is an object suspended from a string or light rod that is able to swing back and forth. It is a device used in such objects as clocks. It is made of a string with a bob attached to the end, this is suspended form a point where the pendulum can swing back and forth. Galileo was the first to make a theory about pendulums. He watched one of the lamps swaying, which was suspended from the ceiling of the church he was in. He noticed that as the size of the swing (arc) got smaller the time of the swing remained the same. He knew this as he timed the oscillation against his pulse. It was Christiaan Huygens that came up with the formula for calculating the period of a pendulum’s swing. One complete swing of a pendulum is called an oscillation. The time for a complete swing or arc is called a period.

We were asked to pursue an experiment with a pendulum. In this experiment I plan to investigate to see if changing the length of the string of the pendulum effects the period of the oscillation. I will do this by measuring the time it takes for ten oscillations, then divide that by ten to find the time it takes for one oscillation. I will do this at ten equally staggered lengths of string.

Middle

1.54

50

14.06

1.41

40

12.58

1.26

30

10.90

1.09

20

8.88

0.89

10

6.28

0.63

## Quantitative prediction

I found that in the predicted results I could estimate the period of a pendulum of any given length if I had the results for one given length’s period.

If I had the period for a piece of string of 10cm, then I could find the time for one oscillation of a pendulum with a length of 20 by this formula:

T (period)=0.63 when l=10 centimetres

So as we are doubling the length we times the period by the square root of 2.

__

0.63 x √ 2 = 0.89

If you look up at the table of predicted results, 0.89 is the predicted period of a pendulum of a 20cm length.

This formula also works for any length you want to find. You just times the given period by the square root of the number of times bigger the length of string is you want to find the period for.

So if we wanted to find the period if the string was 50cm then we would times the period for one oscillation at 10cm by the square root of 5 because 50cm is 5 times bigger than 10cm:

__

0.63 x √ 5 = 1.41

As you can see from my table of predicted results, this was also correct.

Fair testing

Conclusion

I think my results were quite accurate and we only had one result that was extremely different. This was our only anomaly and I think it was caused because we were nor really concentrating and being entirely accurate.

I think my results were reliable enough to draw the conclusion that the length of the string has a big impact on the period of the pendulum. As the length of the string decreased so did the period.

I think this experiment could be made more accurate if we had had more time to pursue it, we would have been more accurate with our measurements. One of the main problems we had with this experiment was keeping the retort stand steady. When the string was at its longest length the stand would wobble. We overcame this problem by putting lots of weights on the base and it eventually worked. I think that if we took more readings at each length then we could possibly draw a better conclusion.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion 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 GCSE Forces and Motion essays

1. ## Investigating Impact Craters

The results for this relationship are not sound enough for a conclusion to be made. Conclusions and Evaluation The following relationships were found: * For vertical drops, the drop height, ball mass and ball diameter all have a linear relationship with the resulting crater's diameter and depth.

2. ## Period of Oscillation of a Simple Pendulum

I suspect that as the other experiments were faily accurate in their timing, it could be due to the method of the experiment itself - perhaps it was not a fair test. My end conclusion did not correspond with the actual results but did correspond with my hypothesis.

1. ## Physics Coursework: To investigate the Oscillations of a mass on a spring

It is also supported by various theories and laws, which are explained below. First of all, it is common sense that the as more springs are used (series), the further down it will get pulled so the amplitude of the extension depends on the force.

2. ## This investigation is associated with the bounce of a squash ball. I will be ...

means that if the volume stays constant and temperature is increased then the pressure must increase. The increase in pressure means that the squash ball will bounce higher. Another equation can be brought in here as pressure increase means a greater force is created as the area of the ball

1. ## The Pendulum

Next we will completely redo the whole experiment, starting at 5cm up to about 95cm at about 90 degrees. 14) Finally we will find out the averages for each length and record the results on to a graph. How this will be a fair test: Because every time we

2. ## FACTORS AFECTING SIMPLE PENDULUM`S PERIOD

=0.635 * I did not have to change my experiment as I found it work well but there are some slight problems with my results in the length of 10cm and 55cm and order to explain them I need to introduce some new terms.

1. ## Strength of a string practical investigation

The yield stress is the amount of stress it takes for a material to yield, this would be when the string gives before it breaks/snaps, at these points it is permanently deformed and cannot return to its original state (also called elastic limit).

2. ## An Investigation to discover whether the string length of a pendulum affects the pendulum ...

For my investigation, I predict that the length of string does affect the pendulum. I think that when the string is shortened, the time it takes the pendulum to do one complete swing (there and back again) will be shorter than when it was longer. • Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to 