Constant Force Spring

DCS Code: 1G10.17 Last Updated: March 27, 2026
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Purpose

Demonstrates that constant-force springs provide uniform tension regardless of extension, contrasting with Hooke's Law springs where force is proportional to displacement. Attaching a mass to the cable produces neutral equilibrium at any position within the spring's range.

Constant-force spring return reel with three white plastic drums mounted on a metal base plate, with a small coil spring visible at bottom and a pencil shown for scale
Figure 1: Constant-force spring-powered return reel with two storage drums and one output drum on a metal mounting plate.