Apr 4, 2016
A few ideas below...
Not to sure on the context of this, but if you are using the laws of Simple Harmonic Motion to determine say, gravity, using
- A pendulum only exhibits SHM for small displacements (systematic error if too large)
- You should measure the period by determining the time of as large a number of oscillations as possible (reducing random errors)
- take several different readings
I'm not 100% sure if this is what the question is aiming at.