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CAIE A-Level Physics AS 6.1.5 The Terms Stress Strain and the Young Modulus Questions

Define stress, strain and Young modulus and use Young modulus = stress / strain.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Define stress, strain and Young modulus and use Young modulus = stress / strain.

CAIE A-Level Physics AS 6.1.5 The Terms Stress Strain and the Young Modulus Questions question 1

[Maximum number: 2]

Fig. 4.1 shows the variation with extension x of the tensile force F for two wires, G and H, made from the same material.

Fig. 4.1

Fig. 4.1

The elastic limit has not been exceeded for G or H.

Wires G and H are joined together end-to-end to form a composite wire of negligible weight. The composite wire hangs vertically from a fixed support.

A block of weight of 2.0 N is attached to the end of the wire, as shown in Fig. 4.2.

Fig. 4.2

Fig. 4.2

The original length of wire G is L and the original length of wire H is 1.5 L.

Calculate the ratio

 cross-sectional area of wire G cross-sectional area of wire H\frac{\text { cross-sectional area of wire } \mathrm{G}}{\text { cross-sectional area of wire } \mathrm{H}}
ratio =
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