1. Physical quantities and units

• understand that all physical quantities consist of a numerical magnitude and a unit

• make reasonable estimates of physical quantities included within the syllabus

1.2.1The following SI base quantities and their units: mass (kg), length (m)

• recall the following SI base quantities and their units: mass (kg), length (m), time (s), current (A), temperature (K)

1.2.2Derived units as products or quotients of the SI base units and use the

• express derived units as products or quotients of the SI base units and use the derived units for quantities listed in this syllabus as appropriate

1.2.3SI base units to check the homogeneity of physical equations

• use SI base units to check the homogeneity of physical equations

1.2.4The following prefixes and their symbols to indicate decimal submultiples or

• recall and use the following prefixes and their symbols to indicate decimal submultiples or multiples of both base and derived units: pico (p), nano (n), micro (μ), milli (m), centi (c), deci (d), kilo (k), mega (M), giga (G), tera (T)

• understand and explain the effects of systematic errors (including zero errors) and random errors in measurements

• understand the distinction between precision and accuracy

• assess the uncertainty in a derived quantity by simple addition of absolute or percentage uncertainties

• understand the difference between scalar and vector quantities and give examples of scalar and vector quantities included in the syllabus

• add and subtract coplanar vectors

• represent a vector as two perpendicular components