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phys: misc fixes and improvements #9

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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 |
| 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"
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 = $kg \times m \times s^{-2}$.
!!! note "Definition"
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