Chapter 1

Motion, Forces and Energy

Speed, acceleration, forces (F = ma), weight, work, energy and power — with an interactive exercise.

Motion, Forces and Energy covers speed, acceleration, forces, work, energy and power.

Key formulae

Speed $= \dfrac{\text{distance}}{\text{time}}$ · Force $F = ma$ · Weight $W = mg$ · Power $= \dfrac{\text{energy}}{\text{time}}$

Force is measured in newtons (N). Using $g = 10$ N/kg, a 2 kg mass has weight $2 \times 10 = 20$ N.

Remember

  • $F = ma$ · Weight $= mg$.
  • Energy is conserved — it only changes form.

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