Contents

Motion, forces and energy

Thermal physics

Waves

Electricity and magnetism

Magnets and magnetic fields
Static electricity and electric fieldsBeing prepared
Current and circuit diagramsBeing prepared
Voltage and resistanceBeing prepared
Series and parallel circuitsBeing prepared
Sensors and potential dividersBeing prepared
Electricity at homeBeing prepared
ElectromagnetsBeing prepared
The motor effectBeing prepared
Generators and inductionBeing prepared
Transformers and the gridBeing prepared

Nuclear physics

Inside the nucleusBeing prepared
Ionising radiation and safetyBeing prepared
Radioactive decay and half-lifeBeing prepared

Space physics

Earth, Sun and MoonBeing prepared
The Solar System and orbitsBeing prepared
Stars and their life cycleBeing prepared
The expanding UniverseBeing prepared

Part 2 of 2

Page 02

Spring constant and the limit of proportionality

define

Try it yourself

Supplement. Which statement defines the spring constant of a spring?

define: give the precise meaning.

Choose one answera.The extension of the spring for each newton of loadb.The force on the spring for each unit of its extensionc.The largest load that the spring can safely hold upd.The load at which the graph stops being a straight line

What is its unit?

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Scope and sources

Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.

Forces may produce changes in the size and shape of an object (1.5.1.1); sketch, plot and interpret load–extension graphs for an elastic solid and describe the associated experimental procedures (1.5.1.2); the spring constant as force per unit extension, k = F/x (1.5.1.9); the limit of proportionality of a load–extension graph, identified on the graph (1.5.1.10). 1.5.1.9 and 1.5.1.10 are Supplement. The elastic limit is not required and is not used. Resultant forces and F = ma are in Resultant force, friction and drag in Acceleration, falling and drag, moments in Moments and balance, and elastic potential energy in Energy, work and power.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus