Why must every physics measurement include both a number and a unit?
Without a unit, the scale or size of the measurement is unknown (e.g. 12 could be mm, m, or km).
Without a unit, the accuracy or precision of the measurement is unknown (e.g. 12 could be exact, rounded, or estimated).
Without a unit, the instrument or method of the measurement is unknown (e.g. 12 could be measured using a ruler, balance, or clock).
Without a unit, the direction or position of the measurement is unknown (e.g. 12 could be north, south, or west).
Flashcards for Edexcel GCSE Physics Units and prefixes, covering the key terms, definitions and equations you need to recall for Paper 1 and Paper 2. 23 cards, matched to the Edexcel GCSE Physics (1PH0) specification. Recall questions account for roughly 40% of marks at GCSE Physics, so these target the marks you can secure before the paper starts.
