Practical skills Flashcards
Chap 1
1
Q
What is the main way to increase accuracy?
A
Take 3 repeat meanings and calculate mean
2
Q
What reduces RANDOM error
A
More sensitive equipment to reduce uncertainty (eg smaller graduations)
3
Q
What reduces SYSTEMATIC error
A
Calibrating equipment
4
Q
How to work out uncertainty: analogue vs digital
A
Analogue: 1/2 smallest graduation
Digital: the resolution
5
Q
When measurement gets smaller, does % uncertainty get bigger or smaller?
A
Bigger
6
Q
% uncertainty formula
A
(Uncertainty/measurement) x 100
7
Q
When you take 2 readings (eg length, temp) what is the % uncertainty formula?
A
(2 x uncertainty / quantity measured) x 100
8
Q
Why is systematic error more problematic?
A
*affects all results
*dont realise
*affects mean
