Chapter 4 Equilibrium Equilibrium Under the Action of Concurrent Forces.

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Presentation transcript:

Chapter 4 Equilibrium Equilibrium Under the Action of Concurrent Forces

4 Concurrent forces are forces whose line of action all pass through a common point. Common Point

4 For Non-Concurrent Forces you get a rotation.

Equilibrium means that... 4 …there is no rotation. 4 …there is no acceleration. 4 …there is no net force acting on the object.

Forces 4 Gravitational Force (or Weight) W = mg 4 Tension T 4 Friction Force f =  s F N

4 Normal Force N 4 Applied Force F Forces

Problem Solution Method 4 Isolate the object for discussion. 4 Show the force acting on the isolated object in a diagram (the free body diagram). 4 Find the rectangular components of each force. 4 Write the first condition for equilibrium in equation form. 4 Solve for the require quantities.

On to problems...