Topic Overview

What students will cover

This topic makes the mechanics of materials explicit and practical. You need to move between graphs, definitions, equations, and laboratory evidence throughout the topic. Start with force-extension behaviour, then use stress and strain to compare materials before finishing with Young modulus, elastic limits, and stored energy.

Revision

Topic revision route

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Recall vocabulary

  • load

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • extension

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • compression

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • limit of proportionality

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • spring constant

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • Stress

    force per unit cross-sectional area.

  • Strain

    extension per unit original length.

  • Young modulus

    stress divided by strain in the linear elastic region.

  • elastic deformation

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • plastic deformation

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • elastic potential energy

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  • Hooke's law

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  • cross-sectional area

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  • wire

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • gradient

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  • elastic limit

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • force-extension graph

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

  • deformation of solids

    A definition has not been added for this term yet. Use the lesson sequence below to review where it appears.

Resource bank

Lesson resources
7
Topic resources
0

Open the relevant lesson first, then use its linked slides, worksheets, simulations, or practice tasks.

Syllabus

CIE 9702 coverage in this topic

10 points across 4 lessons

Show details
6.1.1

understand that deformation is caused by tensile or compressive forces (forces and deformations will be assumed to be in one dimension only)

6.1.2

understand and use the terms load, extension, compression and limit of proportionality

6.1.3

recall and use Hooke’s law

6.1.4

recall and use the formula for the spring constant k = F / x

6.1.5

define and use the terms stress, strain and the Young modulus

6.1.6

describe an experiment to determine the Young modulus of a metal in the form of a wire

6.2.1

understand and use the terms elastic deformation, plastic deformation and elastic limit

6.2.2

understand that the area under the force–extension graph represents the work done

6.2.3

determine the elastic potential energy of a material deformed within its limit of proportionality from the area under the force–extension graph 1 1

6.2.4

recall and use EP = 2 Fx = 2 kx2 for a material deformed within its limit of proportionality

Lessons

Lesson sequence

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