Quick questions on Solids under stress: Hooke's law and the Young modulus - WJEC A-Level Physics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is measuring the Young modulus?

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A specified practical measures

E

for a wire: hang masses to stretch a long thin wire, measure extension with a marker and reference, and plot stress against strain. Using a long thin wire makes the extension larger and easier to measure, reducing percentage uncertainty.

What is q1?

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A wire of cross-sectional area

2.0\times10^{-7}\,\text{m}^2

and length

1.5\,\text{m}

extends by

1.2\,\text{mm}

under a

40\,\text{N}

load. Find the Young modulus. [3 marks]

What is q2?

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Explain the difference between elastic and plastic deformation. [2 marks]

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