GNG 1105 Lecture Notes - Lecture 6: Sign Convention, Harmonic Oscillator, Rigid Body
15 Apr 2018
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Chapter 3: moments and equivalent systems of forces. Objectives: understand the difference between particles and rigid bodies, understand moments of forces acting on rigid bodies, know how to reduce a system if multiple forces into an equivalent single force and couple system. Definition: a body that does not deform when loaded. Real objects are never perfectly rigid, but deformations are small meaning there are no effects on conditions of equilibrium. Rigid bodies have dimensions and forces can be applied at different points can"t be treated as particles. Conditions of equilibrium are unchanged if you slide a force along its line of action. 2 situations shown in fbd ( pull or push) are equivalent if t1=t2 (same magnitude, line of action and direction. ) Because rigid bodies have dimensions, applied forces may tend to create translational motion and rotational motion. When forces are added outside the niddle the objects is made to want to rotate.
