Physics 9702 · AS & A Level · Elastic and plastic behaviour

Elastic and plastic behaviour — practice question

A spring is extended across a range for which elastic deformation takes place. Its spring constant is $3.0\,\text{N cm}^{-1}$. Which row gives the correct extension and strain energy for the stated applied force?

  • Aforce $3.0\,\text{N}$, extension $1.0\,\text{cm}$, strain energy $1.5\,\text{mJ}$
  • Bforce $6.0\,\text{N}$, extension $2.0\,\text{cm}$, strain energy $120\,\text{mJ}$
  • Cforce $12.0\,\text{N}$, extension $3.0\,\text{cm}$, strain energy $180\,\text{mJ}$
  • Dforce $24.0\,\text{N}$, extension $8.0\,\text{cm}$, strain energy $960\,\text{mJ}$

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