The idea of proportional relationships is commonly seen in GCSE maths and science lessons. Often students understand these to be a simple case of ‘when one goes up, the other goes up’. Unfortunately, at A-level this lacks the detail necessary to tell the full story.
If we think about Hooke’s law, we know that the extension of a spring is directly proportional to the force applied. In other words, as we increase the force, the extension will increase:
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