• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5

# What effects the period of a pendulum?

Extracts from this document...

Introduction

## Alun Roberts

Physics Practical

What effects the period of a pendulum?

## Aim

My aim is to investigate what effects the period of a pendulum.

## The variables in this experiment are:

1. The length of the pendulum.
2. The size of the pendulum’s swing or displacement.
3. The mass of the pendulum.
4. The shape and air resistance of the pendulum.

## Scientific Explanation

As the pendulum swings from its fixed point it contains energy and as it swings it goes through energy transfers. At the top of its swing the pendulum is for a moment still or stationary, at that point it has its maximum gravitational potential energy and has no kinetic energy. When the pendulum falls from the top of its swing its speed increases and is at it’s most at the bottom of the swing. Here it has its most kinetic energy and its least potential energy, as the pendulum rises to the top of its swing the speed decreases until it is stationary at the top again. Here it has no kinetic energy but has its most gravitational potential energy again. As the pendulum

Middle

22.37

58

25

10

30.75

1. Changing the length of the pendulum.
1. Changing the size of the swing [displacement]
 Length [cm] Mass [g] Displacement [cm] Time for 20 swings [s] 58 25 10 30.94 58 25 30 31.33
1. Changing the air resistance of the pendulum.

This does have a small effect on the pendulum’s time per swing, however this would be very hard to study without using very large pendulums and very accurate timing equipment. Therefore I will not be testing air resistance in this

experiment.

After studying my results from the pre-test I have decided to test the length of the pendulum and not the mass or the size of the swing. I have chosen to do this as this has the greatest affect on the pendulum’s period. In my main experiment to keep the test fair I will be keeping the

Conclusion

To improve my experiment I feel that it would prove worthwhile to find a method to make the pendulum perfectly round to a correct size so that its diameter and radius can be found. This would make the measuring more accurate as we would know exactly where the centre of the pendulum is. Also the string can stretch under the weight of the pendulum slightly so I feel to improve this we could use a more rigid type of string that doesn’t stretch at all.

To extend the investigation I could test the air resistance to prove that this does have an effect on the time per swing. To do this I would have to use much longer string and very big pendulums to easily notice a variation in the results.

Another way of extending the investigation would be instead of having the pendulum swinging I could have it attached to an elastic cord so that it would spring up and down vertically. I would test how the length of the cord and the distance the cord is stretched before release affects the amount of time it takes for the pendulum to rise and fall above the arm it is attached to.

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 how the Length of a Pendulum affects its Period

3 star(s)

By timing 10 periods rather than 1 the change in time from one length to another will also be clearer. This is because the total time will be larger and thus the difference will be larger between each change in length.

2. ## FACTORS AFECTING SIMPLE PENDULUM`S PERIOD

the error bars and hence draw an error box for our length scatter graph earlier we can use the same values here s my graph will look like the one below: Conclusion for viscosity :As we can see from the graph we can draw a straight line through our data (if the error boxes are drawn)

1. ## The determination of the acceleration due to gravity at the surface of the earth, ...

Before moving the pendulum 10? ensure the pendulum hangs vertically at 90? and the edges of the wooden blocks are at 90?. Also measure the length of the pendulum again before starting the swinging of the pendulum to check that the length is correct.

2. ## Determining the acceleration due to gravity by using simple pendulum.

It would be interesting to try shorter and shorter lengths although a limit would be reached when the pendulum moves too quickly to be accurately counted. It may be possible to have some sort of electronic detection system that could automatically count and time the swings.

1. ## What affects the time period of a pendulum.

These are the angle, and the length of the string. There is one other variable and that is the force of gravity; this could vary because the pull of gravity is not the same all over the earth. What will affect the accuracy of results?

2. ## science pendulum experiment

Preliminary Results Length of string (cm) Time to swing once (s) 10 0.49 20 0.99 40 1.22 Angle of release from vertical (degrees) Time to swing once (s) 10 0.79 20 0.83 40 0.91 The preliminary results show that there is more of a contrast in results in between different lengths compared to different angles.

1. ## In this Coursework, we were given the task of investigating some factors which affect ...

carried out: 1- 1 metre length of string was measured using a meter rule from the point of suspension to the centre of mass of the bob. It was adjusted to 0.2 metres by means of releasing the xxxxxxx so the slit in the cork widens and the string can be adjusted.

2. ## The Flywheel as an Alternative Energy Storage Device for Electric Vehicles (EV): Problems Associated ...

But that is not the case. The maximum KE for a flywheel (assuming its moment of inertia is 1/2MR2) is given as follows Substituting equation 3 we have Thus, the maximum allowable energy storage in a flywheel of any size depends only on the strongest and lightest materials we can make.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to
improve your own work