A wire is stretched by a gradually increasing force. The force-extension graph for the wire is shown. Which statement must be correct?

Point \(Q\) is the elastic limit.

Point R is the limit of proportionality.

The area under the graph from P to S is the elastic potential energy stored in the wire.

The area under the graph from \(P\) to \(S\) is the work done in stretching the wire.

Physics

IGCSE&ALevel

CAIE

Exam No：9702_w24_qp_11 Year：2024 Question No：21

Answer:

Knowledge points:

6.1.1 appreciate that deformation is caused by a force and that, in one dimension, the deformation can be tensile or compressive

6.1.2 describe the behaviour of springs in terms of load, extension, elastic limit, Hooke’s law and the spring constant (i.e. force per unit extension)

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

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

A wire is stretched by a gradually increasing force. The force-extension graph for the wire is shown. Which statement must be correct?

Answer:

Knowledge points:

Solution:

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