Question

Question #398ac

Answer 1

A few ideas below...

Explanation:

Not to sure on the context of this, but if you are using the laws of Simple Harmonic Motion to determine say, gravity, using `T=2pisqrt((L/g)`
Then:

1. A pendulum only exhibits SHM for small displacements (systematic error if too large)
2. You should measure the period by determining the time of as large a number of oscillations as possible (reducing random errors)
3. take several different readings

I'm not 100% sure if this is what the question is aiming at.