# Pendulum Practical Report

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• Published : November 4, 2012

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9.2 T1P: Pendulum Practical Report

Aim:
To determine the value of gravitation acceleration using the motion of a pendulum. Identify the causes in variation of this value.

Equipment:
* Slotted Weight
* Retort Stand
* Sticky Tape
* Clamp
* String
* 1 metre ruler
* Timer

Method:
* 1. Gather required equipment.
* 2. Place retort stand onto table and tightly secure the clamp * 3. Tie the slotted weight onto one end of the string, and wrap the other end around the end of the clamp. * 4. Using a piece of sticky tape, secure the string onto the clamp. * 5. Using the ruler, measure and record the length of the string. * 6. Move the weight in a direction parallel to the bench’s edge and no more than 15 degrees. * 7. Release and begin timing simultaneously.

* 8. Each complete oscillation, record the time taken.
* 9. Repeat for 10 oscillations.
* 10. Shorten string to desired amount and repeat.
* 11. Repeat steps 5-10 a further 4 times.

Analysis:

Result Table:

Length (m)| T (seconds)| T² (seconds)| m (gradient)| g (ms^-2)| 0.461| 1.5| 2.25| 4.880694143| 8.08868912|
0.586| 1.64| 2.6896| 4.589761092| 8.601410144|
0.689| 1.75| 3.0625| 4.444847605| 8.881838281|
0.793| 1.86| 3.4596| 4.362673392| 9.049134342|
0.877| 1.88| 3.5344| 4.030102623| 9.795883954|

Average value for m (gradient): 4.46

Average value for g (ms^-2): 8.88 ms^-2

The accepted value of gravity on Earth is 9.8 ms^-2

Accuracy: |8.88 – 9.80| / 9.80 x 100
= 9.39 = Percentage of error

Therefore the degree of accuracy is 90.6%.
This shows that our experiment was fairly inaccurate.

Reliability: Furthest value from the average 8.88 ms^-2 is 9.80 ms^-2
|8.88-9.80| = 0.92
0.92/8.88 = 10.36%

Therefore this experiment is unreliable.

Discussion:

From previous calculations and the graph, we can see that the experiment performed is both inaccurate and unreliable. The...