Physics p3 help [limitations and improvements]

[Boss201]

Can some give me a list of common limitations/uncertainty and their improvment ?

Thanks

 

[<><> Ice <><>]

Uncertainty
Not enough readings to conclude relation
Improvement
Take more readings and plot a graph

This one is always there, so pretty much free marks

 

[Boss201]

i know about this one i want to know for others if you are given a protactor to measure angle or given to oscillate a bob or measuring the time take for a paper cone to fall down.