1.3.8 - Free-body force diagrams

Be able to draw and interpret free-body force diagrams to represent forces on a particle or on an extended but rigid body using the concept of centre of gravity of an extended body.

Use - free-body force diagrams to connect the rule to the data and decision in the question.

This matters because - free-body force diagrams determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - free-body force diagrams to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Free-body force diagrams is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.