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Update 'docs/sph3u7.md'

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magicalsoup 2020-09-24 19:53:12 -04:00
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@ -18,26 +18,13 @@ Every other SI unit is derived from the fundamental SI units. Memorise these!
| Amount of substance | Mole | mol | | Amount of substance | Mole | mol |
| Luminous intensity | Candela | cd | | Luminous intensity | Candela | cd |
### Derived units
These are units that are derived from SI units, meaning that they can be broken down into an expression of SI units. These are also known as **preferred units**.
TODO: add more derived units
|Name|Symbol|Concept|Broken down into SI units|
|---|---|---|---|
|Newton|$N$|Force or weight|$$\frac{Kg \times m}{s^2}$$|
|Joule|$J$|Energy or work|$$\frac{kg \times m^2}{s^2}$$|
|Watt|$W$|Power|$$\frac{kg \times m^2}{s^3}$$|
|Pascal|$Pa$|Pressure|$$\frac{kg}{m \times s^2}$$|
!!! info "Reminder" !!! info "Reminder"
Note that on an assesment, you are expected to derive the SI unit expression given the equation of unit. Note that on an assesment, you are expected to derive the SI unit expression given the equation of unit.
For example Force = mass x acceleration = mass x distance / time / time = $kg \times m \times s^{-2}$. For example Force = mass x acceleration = mass x distance / time / time = $kg \times m \times s^{-2}$.
!!! note "Definition" !!! note "Definition"
Physical Quantity: must always be expressed as the product of **magnitude**(number) and a **unit**. Physical Quantity: must always be expressed as the product of **magnitude**(number) and a **unit**.
Example: $$10m$$ (10 meters). Example: $10m$ (10 meters).
### Metric prefixes ### Metric prefixes