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Published byἈρτεμίδωρος ÁἌλκιμος Δουμπιώτης Modified over 5 years ago
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Static Equilibrium Chapter 9 Sec. 1 & 2
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The Conditions for Equilibrium
Equilibrium-balanced forces acting on the object the system would have zero acceleration
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First Condition for Equilibrium
The sum of the forces in all direction must be equal to zero.
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The first condition for equilibrium is that the forces along each coordinate axis add to zero.
What are the tensions in FA and FB?
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Second Condition for Equilibrium
There can’t be any rotation of the object.
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The second condition of equilibrium is that there be no torque around any axis; the choice of axis is arbitrary.
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Choose one object at a time, and make a free-body diagram showing all the forces on it and where they act. Choose a coordinate system and resolve forces into components. Write equilibrium equations for the forces. Choose any axis perpendicular to the plane of the forces and write the torque equilibrium equation. A clever choice here can simplify the problem enormously. Solve.
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