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Chapter 4 Equilibrium Equilibrium Under the Action of Concurrent Forces Concurrent forces are forces whose line of action all pass through a common point. Common Point For Non-Concurrent Forces you get a rotation. Equilibrium means that... …there is no rotation. …there is no acceleration. …there is no net force acting on the object. Fx Fy Fz 0 Forces Gravitational Force (or Weight) • W = mg Tension •T Friction Force • f = msFN Forces Normal Force •N Applied Force •F Problem Solution Method Isolate the object for discussion. Show the force acting on the isolated object in a diagram (the free body diagram). Find the rectangular components of each force. Write the first condition for equilibrium in equation form. Solve for the require quantities. On to problems...