Equilibrium, Elasticity & Material Properties Explained | Chapter 11 of University Physics
Equilibrium, Elasticity & Material Properties Explained | Chapter 11 of University Physics Chapter 11 examines how rigid bodies remain in balance under forces and how materials deform under stress. You’ll learn the conditions for static equilibrium, locate the center of gravity, construct free-body diagrams, and explore stress-strain behavior including Young’s, shear, and bulk moduli, as well as elastic versus plastic deformation. Conditions for Rigid-Body Equilibrium For a rigid body to be in equilibrium (static or dynamic), two requirements must hold: ΣF = 0 — No net external force (no translation) Στ = 0 — No net external torque about any axis (no rotation) These ensure the object remains at rest or moves with constant velocity without spinning. Center of Gravity & Stability The center of gravity is the point where an object’s weight can be assumed to act. Under uniform gravity, it coincides with the center of mass. Locating this point is crucial when ca...