# Moments

**Moments**are about the**turning effect**produced by a force around a**pivot point**. The further away the force is to the pivot point, the greater the turning effect. As this is linear, the moment of a force about a point can calculated as the product of the magnitude of the force and the distance from the pivot point.

**Moment = F × d**

- If the distance isn't directly given, it can be worked out with some trigonometry magic.

**The overall turning effect on a body can be calculated as the sum of all the moments about a point**choosing clockwise or anti-clockwise as a positive direction.

- In the example above:

6×17 + 4×11 - (3×10 + 1×9)

= 107 Nm**Clockwise**

**Problems relating to bodies in equilibrium can be solved by equating the clockwise and anti-clockwise moments about a point**, given that the body will not be moving. It can also sometimes be helpful to resolve the forces horizontally, especially in scenarios where there is a rod resting on supports.

**A uniform rod can be considered as having its weight acting from its centre.**