A series of free GCSE/IGCSE Physics Notes and Lessons.
The following diagram gives the formula for Hooke's Law: force, spring constant, extension.

Required Practical: Stretching a Spring
Describe how to investigate the relationship between force and extension for a spring.
GCSE Science Required Practical - Hooke's Law
How to carry out the required practical on Hooke's Law and find an unknown mass?
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