**Moment of a force: Part 2**

**The cross product: ****Math you need to know week 4-5**** **

**Moment of Force F around point O:
M**

**Calculating the moment using rectangular
components:**

**Resultant moment: M_{ro}**

**Moment of a force about a specified axis a-a: **

O: any point on *a-a*

**Couple: C**

**Note: **The
moment of a couple does not depend on the point one takes the moment about. In
other words, a moment of a couple is the same about all points in space.