Objectives : find relation ship between amplitude,frequency and vibration. Pevice and materials: statif, tread ,lood, topwatch, and ruler. Working procedures : 1. Arrangement device like the picture. Length of thread 25 cm load in constant A (equilibrium point) .
2. Put the thread to B point(amplitude) swing the load to 10 times and write the time.
3. Repeat again number 1 and 2 with amplitude , 8 cm, 10 cm, 15 cm, write the time.
| No | t ( time in second) | n (number of vibration | Periode (r=t/n) | Frequency (f=n/t) | Length of thread |
| 1 | 5 cm | 10 | 10 times | 1 | 25 |
| 2 | 8 cm | 10 | 10 times | 1 | 25 |
| 3 | 10 cm | 10 | 10 times | 1 | 25 |
| 4 | 15 cm | 10 | 10 times | 1 | 25 |
| No | t ( time in second) | n (number of vibration | Periode (r=t/n) | Frequency (f=n/t) | Length of thread |
| 1 | 5 cm | 9 | 10 times | 1,1 | 20 |
| 2 | 8 cm | 9 | 10 times | 1,1 | 20 |
| 3 | 10 cm | 9 | 10 times | 1,1 | 20 |
| 4 | 15 cm | 9 | 10 times | 1,1 | 20 |
4. Repeat again number 1 and 2 use length of thread are 15 cm and 20 cm
The result:
| No | t ( time in second) | n (number of vibration | Periode (r=t/n) | Frequency (f=n/t) | Length of thread |
| 1 | 5 cm | 8 | 10 times | 1,3 | 15 |
| 2 | 8 cm | 8 | 10 times | 1,3 | 15 |
| 3 | 10 cm | 8 | 10 times | 1,3 | 15 |
| 4 | 15 cm | 8 | 10 times | 1,3 | 15 |
Conclution:
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