Chapter 2
Forces and Moments
Choose a body and identify the forces on it before calculating their resultant or turning effect.
Spaced review
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Identify the body and its forces
Distinguish field and contact forces and draw only the external forces on the chosen body.
Springs and Hooke's law
Calculate extension, use the force constant and interpret a force-extension investigation.
Moments, couples and centre of gravity
Find the perpendicular moment arm and distinguish a couple from a single force or a third-law pair.
Combine force and moment balance
Find support forces and tensions using moments, components and closed vector triangles.