Elastic Strings and Springs

Revise Elastic Strings and Springs for Mechanics 3 WME03 (A2 Level) — revision notes and instant AI marking.

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Edexcel IAL Mechanics 3 (WME03)

The big idea: Tension is proportional to extension, and the energy stored is the area under the tension–extension graph.

Summary — What This Chapter Covers

1. Hooke's Law

Hooke

In equilibrium, balance the tension against the other forces.

Worked Example

A 0.5 kg mass hangs at rest on an elastic string of natural length 0.8 m and modulus 24 N. Find the extension.

2. Elastic Potential Energy

EPE

Include EPE in work–energy equations alongside KE and gravitational PE.

Practice Question

Find the energy stored when that string is stretched by 0.2 m.

Memorise

λx/l

λx²/(2l)

Slack when x < 0

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