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

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

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

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

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