Introduction
Pendulums can be defined as a organic structure suspended from a fixed support so that it swings freely back and Forth under the influence of gravitation, normally used to modulate assorted devices, particularly redstem storksbills.
Worth ( 2008 ) states that pendulums have been used for 1000s of old ages. The ancient Chinese used the pendulum rule to seek and assist predict temblors. Hundreds old ages ago the celebrated Italian scientist Galileo was the first European to truly analyze pendulums and he discovered that their regularity could be used for maintaining clip, taking to the first redstem storksbills. Worth ( 2008 ) goes on to explicate that in 1656, the Dutch discoverer and mathematician, Huygens, was the first adult male to successfully construct an accurate clock. It was the first clip pendulums were used for homo ‘s mundane life.
There are four basic Torahs of a pendulum: Van & A ; Albert ( 1995 ) explain that foremost the clip it takes for a pendulum to finish a swing is related to the square root of the length of twine of the pendulum. Second the clip it takes for the pendulum to swing is related to the square root of the gravitative acceleration. Gravitational acceleration can be defined as the force that attracts objects in infinite towards each other, and that on the Earth pulls them towards the Centre of the planet, so that things fall to the land when they are dropped ( Wikipedia 2010 ) . Third the clip it takes for the pendulum to swing is non related to the mass and stuff of the little ball at the terminal of the pendulum. Finally the clip is independent of the greatest distance that a moving ridge provided the greatest distance that a moving ridge is little.
The rules of a pendulum can be proven. This experiment is traveling to demo the consequence altering gravitative acceleration has on a pendulum, and will find gravitative acceleration utilizing a simple pendulum
Methods
Equipment of finding of gravitative acceleration utilizing a simple pendulum
 A long piece of twine
 A wooden block
 A little ball
 A one metre long swayer
 A protractor
 Vernier calliper
 A stopwatch
This experiment is speaking about finding of gravitative acceleration utilizing a simple pendulum fig 1 was showed that the simple pendulum was used in this experiment.
Procedure
 The long piece of twine and the little ball were connected.
 The little ball was suspended from the wooden block with the long piece of stringA?A?A’such as in figure 1
 The length of the long piece of threading L was measured utilizing the swayer. Then the diameter of the little ball was measured utilizing the Vernier calliper. The long piece of twine was non stretched. It was measured to the Centre of the little ball.
 The little ball was raised up about 15 grades utilizing the protractor, and so released so that oscillations were executed.
 The clip it took for the pendulum to finish a swing T was measured utilizing the stopwatch to clip 50 oscillations.
 Stairss 1 to 5 were repeated for five more values of L, and each portion was done twice to verify the right reply.
Experiment 1 the length of the long piece of twine was measured to 0.4 m
Experiment 2 the length of the long piece of twine was measured to 0.6 m
Experiment 3 the length of the long piece of twine was measured to 0.8 m
Experiment 4 the length of the long piece of twine was measured to 1.0 m
Experiment 5 the length of the long piece of twine was measured to 1.2 m.
Result & A ; Calculation
Below is a tabular array to demo the consequences recorded from trails 1 to 5.
Experiment of finding of gravitative acceleration utilizing a simple pendulum 

Trail 1 
Trail two 

The clip takenTfor 50 oscillation 
The square of period T 
The clip takenTfor 50 oscillation 
The square of period T 

Experiment 1 length of threading 0.4 m ; 
64 s 
1.64 
65 s 
1.69 
Experiment 2 length of threading 0.6 m ; 
78.6 s 
2.47 
78.4 s 
2.46 
Experiment 3 length of threading 0.8 m ; 
90.8 s 
3.30 
91 s 
3.31 
Experiment 4 length of threading 1.0 m ; 
101.25 s 
4.10 
101.2 s 
4.09 
Experiment 5 length of threading 1.2 m 
110.7 s 
4.90 
110.8 s 
4.91 
The mean clip was calculated utilizing the expression
The square of period T was calculated utilizing T times T.
The information in this tabular array can be plotted in a line graph see graph 1. The perpendicular axis shows that the clip takenthe square of period T for 50 oscillation. The horizontal axis shows that the different lengths of the piece of twine. The gradient of the line shows the gravitative acceleration.
Discussion
In this experimentA?A?A’there were controlled variables. Controlled variable can be defined as one which is non allowed to alter erratically during an experiment Answers Corporation ( 2010 ) . The first controlled variable was the figure of swings. Second was the angle of the swing. The last one is mass of the British shilling, we all kept their same. In addon, there was one experimental variable. The experimental variable can be defined as some values in experiment we change on intent. In my experiment, the experimental variable was the length of swings.
Mistake is an experiment word means that error, particularly one that causes jobs or affects the consequence of some thing. The mistake can be caused when the little ball was non raised up about 15 grades, location, the entire figure of oscillation are non 50.
I compared with the information of my schoolmate, the square period T was relative to the length of threading s. All the points of the graph prevarication on a consecutive line so the decision is really dependable over this scope. It seems likely that the same tendency would go on if the twine was made longer. I solve the equation and acquire the acceleration of gravitation is 9.78m/s, it ‘s non truly right. I think the biggest job was that the little ball was non raised up about 15 grades ; location and the entire figure of oscillation are non 50
Decision
This experiment is speaking about finding of gravitative acceleration utilizing a simple pendulum.
First I used five stairss to complete this experiment foremost I connected the long piece of twine and the little ball. Second I Suspended The little ball from the wooden block with the long piece of stringA?A?A’such as in figure 1. Third I measured the length of the long piece of threading L utilizing the swayer and measured the diameter of the little ball utilizing the Vernier calliper. Forth I raised up the little ball about 15 grades utilizing the protractor. Fifth I unclasped the little and utilizing the stopwatch to mensurate the clip it took for the pendulum to finish a swing T.
Second I made a graph to demo my informations about this experiment.
Third I used these informations to cipher the value of gravitative acceleration.
Finally I compared my consequence with my schoolmate to happen error
In my consequences, the first two intents were turn outing. I measured that the gravitative acceleration is 9.78m/s, it smaller than 9.8m/s. I think one of the most of import job is the entire figure of oscillation are non 50. Measuring the entire figure of oscillation about 1.20m is easier than short lengths. Because of the velocity of the length is 1.2m is lower than the velocity of the length is 0.4m
In addon, I think my experiment is good even have some error. I will carefully to mensurate entire figure of oscillation I am traveling to seek my best to allow my informations much exact.