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CAIE IGCSE Physics 1.5.1.2 Load–extension graphs for an elastic

Practise reading spring and elastic-solid data, finding extension, and linking straight-line load-extension graphs to Hooke's law.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • find extension from length and unstretched length in a spring data table
  • read a load-extension graph to determine an unknown weight or initial length
  • sketch or recognise a straight line through the origin for Hooke's law

1.5.1.2—Load–extension graphs for an elastic question 1

[Maximum number: 1]

A force is a vector quantity.

A student suspends a spring from a clamp stand and measures the length l0l_{0} of the spring.

Fig. 2.1 shows the apparatus.

Fig. 2.1 (not to scale)

Fig. 2.1 (not to scale)

The student then suspends loads of different weights from the spring and measures the length of the spring for each load. He then plots a graph of the length of the spring against weight.

Fig. 2.2 is the graph that the student plots.

Fig. 2.2

Fig. 2.2

Using Fig. 2.2, determine the initial length l0l_{0} of the spring.

l0=l_{0}=
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