Hooke’s law (F = k e)
AQA GCSE Physics calculation · part of the free Calculation Climb
For a spring, force = spring constant × extension: F = k e. Extension is how much longer it gets (m); k is the spring constant (N/m).
How to do it — step by step
- extension = stretched length − natural length.
- F = k e. (Rearrange: k = F ÷ e, or e = F ÷ k.)
Worked example
A spring with k = 200 N/m is stretched 0.15 m.
F = 200 × 0.15 = 30 N
Now practise it — free
Science Street's Calculation Climb walks you from a worked example, through a guided step-by-step version, to questions you do yourself — with fresh examples every time and a built-in calculator and periodic table. No sign-up needed.
Practise Hooke’s law (F = k e) on Science Street →