Bungee Cord: k = 50 N/m, 3 m Extension
A bungee cord modelled as a 50 N/m spring stretched 3 m exerts a restoring force of 150 N.
How to use this tool
- Enter spring constant k and displacement x in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your restoring force f and the full breakdown beneath it.
A bungee cord can be modelled with Hooke's Law; a 3 m stretch at 50 N/m generates 150 N — roughly the weight of a 15 kg load.
Frequently asked questions
- What are typical spring constants?
- Car suspension: 10,000–50,000 N/m; pen spring: ~2 N/m; lab spring: 10–100 N/m; human Achilles tendon: ~1000 N/m.
- What does the negative sign mean?
- The restoring force always opposes the displacement, pulling back toward equilibrium. Stretch it right (+x) and the force acts left (−F).