why we use uncertainty in calculation of physic experiment ?

Question

mani_jha · Answer

Because it is not possible to take any reading with 100% accuracy. There is always some error.
Suppose you are measuring the time period of a simple pendulum. You have got to release the bob from its extreme position and start your stopwatch at the same time. There has to be some error - You cant do both at exactly the same time! Then, you have to stop the watch at the exact moment it completes, say, 10 oscillations. Even there will be a little error in that.
So, we always take the uncertainties, so that we are aware of what mistakes we might make in measurement.

anonymous · Answer

thanx for helping me :)

mani_jha · Answer

No problem, where are you from?

anonymous · Answer

malaysia . u must from india right ?

mani_jha · Answer

Ya. Nice to meet you

anonymous · Answer

oh . i had been there last year . i went to new delhi