Statics and Torque
Wright State University
The statics chapter of an open access physics course, built around the two conditions for equilibrium and the role of torque. It closes with the parts most textbooks skip: stability, simple machines, and the forces that muscles and joints carry.
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Basic MechanicsA short and practical introduction to the principles of statics: static equilibrium, static determinacy, vectors and their resultants, moments and the analysis of simple structures. Written for people who need the mechanics behind a building, not the full theory.
Verified PDF · Secure download - Static Equilibrium and Elasticity
The conditions for equilibrium, the centre of gravity and the stability of rotational equilibrium, followed by stress, strain and the elastic behaviour of real materials. Diagram driven throughout, which makes it easy to follow where each force acts.
Verified PDF · Secure download - Static Equilibrium: Forces, Moments and Reactions
Defines forces and moments as vectors, builds the free body diagram from them, and then uses the equations of static equilibrium to solve for reaction forces and moments. The worked cases come from optical mounting, where a millimetre of unwanted motion matters.
Verified PDF · Secure download - Equilibrium of Rigid Bodies
Opens with a step by step procedure for drawing a free body diagram, then covers types of supports and their reactions, Varignon's theorem, moments and couples, and the equilibrium of rigid bodies in both two and three dimensions. Ends with virtual work.
Verified PDF · Secure download - Static Equilibrium: Lever Law and Worked Examples
Works the lever law and its generalised form, then applies both to a suspended rod, a person standing on a hill and the forces inside a knee. An appendix proves that the torques about any two points are equal for a body in static equilibrium.
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