Physics Unit 1 Measurement and Numbers Test Flashcards
1
Q
Numbers as Measurements
A
A number is not a measurement (e.g. 5) It requires a unit so you know what you’re measuring.
2
Q
SI
A
- Systeme International
- created in 1960 to standardize measurement and measurement devices
- 7 units - three of which we know:
- distance: meters (m)
- time: seconds (s)
3
Q
Nano
A
10^-9, n
4
Q
Micro
A
10^-6, µ
5
Q
Milli
A
10^-3, m
6
Q
Centi
A
10^-2, c
7
Q
Deci
A
10^-1, d
8
Q
Kilo
A
10^3, k
9
Q
Mega
A
10^6, M
10
Q
Giga
A
10^9, G
11
Q
Sig Fig Counting Rules
A
- 1-9 rule: all digits 1-9 are significant figures
- Sandwich rule: all zeros that fall between two sig figs are also significant
- Decimal rule: zeros that fall to the right of the decimal and after a sig fig are significant
- Trailing rule: zeros that trail before a decimal are not necessarily significant
12
Q
Sig Fig Calculating Rules: ÷x
A
The Least Rule: the number with the least number of sig figs in a problem dictates the number of sig figs in the answer
13
Q
Sig Fig Calculating Rules: +-
A
The Line Rule: the least amount of places to the right of the decimal dictates the amount of decimal places in the answer
14
Q
How many types of error are there?
A
4
15
Q
Human error
A
a mistake one makes reading or recording results
