Chapter 11 â Equilibrium and Elasticity - UCF Physics

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- Requirements of equilibrium: P = cte → F net dP = = 0 Balance of forces translational equilibrium dt L = dL cte, τ net = = 0 dt Balance of torques rotational equilibrium - Vector sum of all external forces that act on body must be zero. - Vector sum of all external torques that act on the body, measured about any possible point must be zero. Balance of forces F net,x = F net,y = F net,z =0 Balance of torques τ net,x = τ net,y = τ net,z =0
II. Center of gravity Gravitational force on extended body vector sum of the gravitational forces acting on the individual body’s elements (atoms) . cog = Body’s point where the gravitational force “effectively” acts. - This course initial assumption: The center of gravity is at the center of mass. If g is the same for all elements of a body, then the body’s Center Of Gravity (COG) is coincident with the body’s Center Of Mass (COM). Assumption valid for every day objects “g” varies only slightly along Earth’s surface <strong>and</strong> decreases in magnitude slightly with altitude.
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Page 3: Stable static equilibrium: If a bod
Page 7 and 8: III. Elasticity Branch of physics t
Page 9: ∆L Strain = ( fractional change i

Chapter 11 â Equilibrium and Elasticity - UCF Physics

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Chapter 11 â Equilibrium and Elasticity - UCF Physics