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.