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# To find out whether changes in weight and the length of a pendulum will make a difference to the time it takes to make a full swing.

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Introduction

Pendulum

Aim: To find out whether changes in weight and the length of a pendulum will make a difference to the time it takes to make a full swing.

Prediction: During my research on pendulums, I found out from the Internet that I could also find out the value of gravity using pendulums with the following formula:

Due to this and other information I found out I think that I will be able to use my results to find the exact value of gravity. My next prediction is I think the shorter the length of a pendulum, the faster it takes to swing to and fro; I think this because the length is shorter so it is higher up making it swing faster in a shorter time. The weight of a pendulum also changes its time so I also think that the heavier the weight, the faster it swings because it wants to reach the ground faster. If you give the pendulum a swing it will sing back and forth at a certain rate, which is its frequency.

Middle

I will have 5 different string lengths: 25cm, 50cm, 75cm, 100cm and 125cmTo make the results clearer I will time 10 swings and then divide my results by 10 to find the time for 1 swing as timing 1 swing will be harder.I will release the pendulum at a straight horizontal position so I can get an optimum swing from the pendulum.

Results

Different Lengths

 Weight(g) Length(Cm) (1)

Conclusion

n="1" rowspan="1">

1.73

6.61

Different Weights

 Weight(g) Length(Cm) (1)Time Taken for 10 swings (secs) T1÷10 (2)Time Taken for 10 swings (secs) T2÷10 Average(T) T2(2.d.p) 100 75 20.59 2.06 20.50 2.05 2.06 4.24 200 75 20.87 2.09 20.88 2.09 2.09 4.37 300 75 20.84 2.08 20.20 2.02 2.05 4.20 400 75 20.91 2.09 20.82 2.08 2.09 4.37

Observations

While I was carrying out my experiment I experienced a number of observations.

I noticed that when I changed the length of the pendulum, the times varied. The times were shorter at shorter lengths and longer at longer lengths. But when I changed the weight of the pendulum there seemed to be hardly any change in time. Due to my scientific knowledge I think this was caused because the weight will only take effect at a certain time when swinging and there was not enough time for the weight to effect so the time did not change. I think that if I made the length much longer than 75cm then there would have been a significant change in time.

I will now plot the results on a graph to see if there are any unusual patterns that were affected by my results. This can help me find out how the weight or length affects the time it takes to make one swing in a more understandable view.

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

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