# Physics - AS Level - .1 - An Introduction to Units, Symbols and Numbers

## Terms

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Standard Units organised by the:
SI (Le Systeme International d'Unites, 1960) was set up by defining 7 base units.
Name six of the seven units:
Length, mass, current, time, temperature, amount of substance.
What are the quantity symbol, unit and unit symbol for Length?
L, metre, m
What are the quantity symbol, unit and unit symbol for Mass?
m, kilogram, kg
What are the quantity symbol, unit and unit symbol for Time?
t, second, s
What are the quantity symbol, unit and unit symbol for Current?
I, ampere, A
What are the quantity symbol, unit and unit symbol for Temperature?
T, kelvin, K
What are the quantity symbol, unit and unit symbol for Amount of substance?
n, Mole, mol
Convert deg C to deg K:
Define MOLE:
1 mole is the amount of substance that has the same number of atoms as there are in 12g of carbon-12. This specific number of atoms is called Avogadro's Number and is equal to 6.02 x 10^23 mol^-1
Velocity =
distance / time (m s^-1)
acceleration =
velocity change / time (m s^-2)
density =
mass / volume (kg m^-3)
What are the quantity symbol, unit and unit symbol for Force?
F, newton, N (or midichlorians) F=ma (kg m s^-2)
What are the quantity symbol, unit and unit symbol for Pressure?
p, Pascal, Pa
What are the quantity symbol, unit and unit symbol for Power?
P, watt, W
What are the quantity symbol, unit and unit symbol for Potential difference?
V, volt, V
What are the quantity symbol, unit and unit symbol for Work?
W, joule, J
Standard form indices - how?
number of places d p moves, - if small, + if big.
Sig Fig
number inclusive of the numbers between the first and last non-zero digits.
10^18
exa, E
10^15
peta, P
10^12
tera, T
10^9
giga, G
10^6
mega, M
10^3
kilo, k
10^-3
milli, m
10^-6
micro, wierd greek u with a drip
10^-9
nano, n
10^-12
pico
10^-15
femto, f
10^-18
atto, a
E
exa, 10^18
P
peta, 10^15
T
tera, 10^12
G
giga, 10^9
M
mega, 10^6
k
kilo, 10^3
wierd greek u with a drip thing
micro, 10^-6
n
nano, 10^-9
f
femto, 10^-15
a
atto, 10^-18

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