- #1
Raul Lai
- 23
- 0
Aim: To measure the acceleration due to gravity using a simple pendulum.
source of error
1. The length of thread between the bob and the coins is not measured by very accurate instruments. Since meter ruler has a large percentage error, as a result, it should be replaced by a vernier caliper.
2. The reaction time of human may also introduce an error to the measurement of 20 completed oscillations of the bob. It can be reduced by using rhythm to count before started.
3. The damping occurred to reduce the amplitude of SHM. The time for counting the oscillation is shorted. The driving frequency of the external force should be closer to the natural frequency of the system and the angle between the bob and vertical should be small in order to diminish the damping.
4. The bob started rotating by the impact of the Earth’s revolution. It disturbs the measurement of counting the oscillation. The experiment should start quickly after moving the bob.
Is that correct?
And one more thing, do the period against length (the string) graph pass through the origin?
The result in my experiment didn't.
source of error
1. The length of thread between the bob and the coins is not measured by very accurate instruments. Since meter ruler has a large percentage error, as a result, it should be replaced by a vernier caliper.
2. The reaction time of human may also introduce an error to the measurement of 20 completed oscillations of the bob. It can be reduced by using rhythm to count before started.
3. The damping occurred to reduce the amplitude of SHM. The time for counting the oscillation is shorted. The driving frequency of the external force should be closer to the natural frequency of the system and the angle between the bob and vertical should be small in order to diminish the damping.
4. The bob started rotating by the impact of the Earth’s revolution. It disturbs the measurement of counting the oscillation. The experiment should start quickly after moving the bob.
Is that correct?
And one more thing, do the period against length (the string) graph pass through the origin?
The result in my experiment didn't.
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