Chapter 12 Canvas.pptx - Chapter 12 Equilibrium and Elasticity Physics 140 Rakhsha Nasseripour What is “Equilibrium” We often want objects to be

Chapter 12 Canvas.pptx - Chapter 12 Equilibrium and...

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Chapter 12 Equilibrium and Elasticity Physics 140 Rakhsha Nasseripour
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What is “Equilibrium”? We often want objects to be stable despite forces acting on them. Consider a book resting on a table, a puck sliding with constant velocity, a rotating ceiling fan, a rolling bicycle wheel with constant velocity. These objects have the characteristics that: 1. The linear momentum of the center of mass is constant. 2. The angular momentum about the center of mass, or any other point, is constant. Such objects are in equilibrium.
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What is “Static Equilibrium”? In this chapter we are largely concerned with objects that are not moving at all; linear and rotational momentum are zero P = L = 0 These objects are in static equilibrium The only one of the examples from the previous page in static equilibrium is the book at rest on the table.
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Stable/Unstable Equilibrium
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Zero Torque and Static Equilibrium Static equilibrium occurs when an object is at rest – neither rotating nor translating.
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