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Why units matter

Why units matter

Summary chart of base SI units kg, m and s with derived units for speed, acceleration, force, gravitational field strength, moment and momentum

Every measurement needs both a number and a unit. Saying a track is "100" long is incomplete until you know whether that means m, cm, or km.

Units Lesson

  1. IGCSE
  2. /Physics
  3. /Units

Step-by-step lessons on Edexcel IGCSE Physics Units. Each one builds up to exam-style questions. Build a strong foundation in mechanics and electricity before tackling the more mathematically demanding astrophysics and nuclear topics.

Lessons