M2.5.2 - Equilibrium of rigid bodies

Equilibrium of rigid bodies.; Problems involving parallel and non-parallel coplanar forces.; Problems may include rods or ladders resting against smooth or rough vertical walls and on smooth or rough ground.

Use equilibrium of rigid bodies to connect the rule to the data and decision in the question.

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

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

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