Elastic potential energy of spring (U = ½kx²)
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U = ½kx²
What each symbol means
| Symbol | What it stands for |
|---|---|
| U | Elastic potential energy stored (J) |
| k | Spring constant (N/m) |
| x | Extension or compression from natural length (m) |
When to use this
Ideal spring obeying Hooke's law; U=0 taken at natural length.