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phys: misc fixes and improvements #9

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@ -22,10 +22,6 @@ Every other SI unit is derived from the fundamental SI units. Memorise these!
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).
### Metric prefixes
Every SI unit can be expanded with metric prefixes.
@ -155,7 +151,7 @@ Error bars represent the uncertainty of the data, typically representing that da
The uncertainty of the **slope** of the line of best fit is the difference between the maximum and minimum slopes.
$$m_{\text{best fit}} ± \frac{m_{\max}-m_{\min}}{2}$$
The uncertainty of the **intercepts** is the difference between the intercepts of the maximum and minimum lines.
$$\text{intercept}_{\text{best fit}} ± \frac{\text{intercept}_{\max} - intercept_{\min}}{2}$$
$$\text{intercept}_{\text{best fit}} ± \frac{\text{intercept}_{\max} - \text{intercept} _{\min}}{2}$$
## 1.3 - Vectors and scalars