# 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:
- add 273
- 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