Specification References: G3.7 G3.7 Understand and use compound measures. |
Density will not be tested at Foundation tier.
Calculations involving distance and time will be restricted to hour, hour, hour, hour or a whole number of hours.
Units of speed will be given as miles per hour (mph), kilometres per hour (km/h), or metres per second, m/s m s-1. Candidates who express speed in alternative units such as metres per minute will not be penalised providing the units are clearly stated.
Density will be given as gm/cm3 or kg/m3. Candidates who express density in alternative units such as grams per cubic metre will not be penalised providing the units are clearly stated.
Compound measures may be expressed in the form metres per second, m/s, m s-1.
Candidates would be expected to understand speed and know the relationship between speed, distance and time. Units may be any of those in common usage such as miles per hour or metres per second. The values used in the question will make the required unit clear.
Other compound measures that are non-standard would be defined in the question, e.g. population density is population/km2.