CH1-Physical quantities and units Flashcards
1
Q
What is a physical quantity?
A
Something that can be measured (has a pure number and a unit)
2
Q
What are base quantities and units?
A
Base quantities are the original physical quantities that can be measured. Base units are the original units of these quantities
3
Q
Tera
A
10^12
4
Q
Giga
A
10^9
5
Q
Mega
A
10^6
6
Q
Kilo
A
10^3
7
Q
Deci
A
10^-1
8
Q
Centi
A
10^-2
9
Q
Milli
A
10^-3
10
Q
Micro
A
10^-6
11
Q
Nano
A
10^-9
12
Q
Pico
A
10^-12
13
Q
Base unit of distance/length
A
metre (m)
14
Q
What are homogenous equations?
A
Where LHS=RHS (excluding the constants in the equation)
15
Q
What is accuracy and precision?
A
Accuracy- when the answer is closest to the true value
Precision- When the answer has more decimal places (the experiment has been conducted many times)
