1.2 SI units

4 of 4 objectives have lessons · 0 studied · 0 secure

Lessons

SI base units and derived unitsFive SI base units (kg, m, s, A, K) build every other unit you need, by following each quantity's defining equation. 5 min, not started
Checking equations are homogeneousAn equation is homogeneous when every term has the same SI base units; a failed check proves it wrong, but a pass does not prove it right. 4 min, not started
Prefixes and powers of tenTen prefixes from pico to tera scale any unit by a power of ten; the traps are capital letters and squared or cubed units. 5 min, not started

Syllabus objectives

4 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

1.2.1

Recall these SI base quantities together with their units: mass (kg), length (m), time (s), current (A) and temperature (K).

Taught in: SI base units and derived units · 2 questions

1.2.2

Write derived units as products or quotients of SI base units, and use the appropriate derived units for the quantities in this syllabus.

Taught in: Checking equations are homogeneous, SI base units and derived units · 5 questions

1.2.3

Check whether a physical equation is homogeneous by using SI base units.

Taught in: Checking equations are homogeneous · 5 questions

1.2.4

Recall and use the following prefixes, with their symbols, for decimal multiples and submultiples of base and derived units alike: pico (p), nano (n), micro (μ), milli (m), centi (c), deci (d), kilo (k), mega (M), giga (G) and tera (T).

Taught in: Prefixes and powers of ten · 6 questions