Physics·Scientific processes · NSSCO 1.2.4
Basic units & derived units
Narrated lesson · press play
Every measurement in physics needs a unit, and using them correctly is half the marks. We meet the SI base units and the derived units built from them, see how length, area and volume relate on metric scales, use the prefixes from mega down to nano, write huge and tiny numbers in standard form, round to the right number of significant figures, and state units the accepted way (m/s or m s⁻¹).
What you'll learn in this lesson
By the end you should be able to (NSSCO Physics 1.2.4):
- Identify the correct SI base units and common derived units
- Explain and use the relationship between length, area and volume and their metric units
- Explain and use multiple prefixes (mega, kilo) and sub-multiple prefixes (centi, milli, micro, nano)
- Write numbers in standard (scientific) notation
- Round a value to an appropriate number of significant figures
- State units the accepted way, e.g. metres per second as m/s or m s⁻¹
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