M1.4.4 - Coefficient of friction

Coefficient of friction.; An understanding of F = μR when a particle is moving.

Use coefficient of friction to connect the rule to the data and decision in the question.

This matters because coefficient of friction determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply coefficient of friction to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Coefficient of friction is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.