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.
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
Zero Torque and Static Equilibrium Static equilibrium occurs when an object is at rest – neither rotating nor translating.

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