2.1 Physical Quantities and units Flashcards
1
Q
What is a quantity?
A
- a measurement of something
2
Q
What is the systeme international (S.I.)?
A
- international scientific community that agreed to adopt a single unit for each quantity:
- kilogram, kg (mass)
- metre, m (length)
- second, s (time)
- kelvin, K (temperature)
- ampere, A (current)
- mole, mol (amount of substance)
- candela, cd (luminous intensity)
3
Q
Acceleration units?
A
Ms-2
4
Q
Density units?
A
Kgm-3
5
Q
Units of electric charge?
A
C
6
Q
Units of energy?
A
J
7
Q
Unit of force?
A
N
8
Q
Unit of momentum?
A
Kgms-1
9
Q
Unit of potential difference?
A
V
10
Q
Unit of power?
A
W
11
Q
Unit of pressure?
A
Pa
12
Q
Unit of velocity?
A
Ms-1
13
Q
Prefix pico (p)?
A
10^-12
14
Q
Prefix nano (n)?
A
10^-9
15
Q
Prefix micro (u) ?
A
10^-6
16
Q
Prefix milli (m)?
A
10^-3
17
Q
Prefix centi (c)?
A
10^-2
18
Q
Prefix deci (d)?
A
10^-1
19
Q
Prefix kilo (k)?
A
10^3
20
Q
Prefix mega (M)?
A
10^6
21
Q
Prefix giga (G)?
A
10^9
22
Q
Prefix tera (T)?
A
10^12
23
Q
What does it mean to prove an equation is homogenous?
A
- prove that the units for each part of the equation are the same
