What this topic covers
Principle of moments: Torque/Moment of force, simple treatment of a couple (e.g., turning water tap, corkscrew, steering wheel). Conditions for equilibrium of rigid bodies under parallel and non-parallel forces: Use of force board for resultant and equilibrant forces, resolution into perpendicular directions, composition of forces, parallelogram of forces, triangle of forces. Centre of gravity and stability: Experimental treatment, including stable, unstable, and neutral equilibra.
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