PHYS 2 Lecture Notes - Lecture 4: Free Body Diagram, Stress (Mechanics), Shear Stress
Document Summary
Choose a point that makes the torque equation simples. Force won"t appear in the torque equation if it acts at the point you choose. In problems with combined translation and rotation, we were advised to calculate torques around the center of mass (for rolling without slipping, we could also use the instantaneous point of contact). Net external force on an object must be zero. Net external torque on the object must be zero. If (1) is true and (2) is true for a certain origin, then (2) is true for any origin. A rock is attached to the left end of a uniform meter stick that has the same mass as the rock. A metal advertising sign (weight ) is suspended from the end of a massless rod of length . The rod is upported at one end by a hinge at point and at the other end by a cable at an angle from the horizontal.
