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phys: fix factual errors

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eggy 2020-09-24 20:39:28 -04:00
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docs/sph3u7.md
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@ -112,7 +112,7 @@ Uncertainties are stated in the form of [value] ± [uncertainty]. A value is onl
To determine a measurement's absolute uncertainty, if:
- the instrument states its uncertainty, use that.
- an analog instrument is used, the last digit is estimated and appended to the end of the reported value. The estimated digit is uncertain by 5 at its order of magnitude.
- an analog instrument is used, half of the most precise reading is uncertain.
- a digital instrument is used, the last reported digit is uncertain by 1 at its order of magnitude.
!!! example
@ -142,16 +142,16 @@ Error bars represent the uncertainty of the data, typically representing that da
<img src="/resources/images/error-slopes.png" width=700>(Source: Kognity)</img>
The uncertainty of the **slope** of the line of best fit is the difference between the maximum and minimum slopes.
$$m_{best fit} ± m_{max}-m_{min}$$
$$m_{best fit} ± \frac{m_{max}-m_{min}}{2}$$
The uncertainty of the **intercepts** is the difference between the intercepts of the maximum and minimum lines.
$$intercept_{best fit} ± intercept_{max} - intercept_{min}$$
$$intercept_{best fit} ± \frac{intercept_{max} - intercept_{min}}{2}$$
## 1.3 - Vectors and scalars
!!! note "Definition"
- **Scalar:** A physical quantity with a numerical value (magnitude) and a unit.
- **Vector:** A physical quantity with a numerical value (magnitude), a unit, and a **direction.**
- **Vector:** A physical quantity with a **non-negative** numerical value (magnitude), a unit, and a **direction.**
??? example
- Scalar quantities include speed, distance, mass, temperature, pressure, time, frequency, current, voltage, and more.