1. a)2D moments about a point (torques) b)3D moments about a point ENGR 34 Chapter 4, Day 1 Moments about a Point

2. 2D Moments, computation options: Shortest distance & RHR Perpendicular force & RHR By components & RHR |M| = |F| |r| sin  & RHR Use calculator cross product

3. 3D Moments, computation options: Shortest distance Perpendicular force By cartesian components |M| = |F| |r| sin  Use calculator cross product

4. Moments about a Point Key Ideas 2D use RHR and shortcuts (shortest…) 3D use vectors & calculator cross prod. R from point to anywhere on line of action