# Moment meaning in physics

Sometimes a force causes an object to rotate or turn.

A moment is a measure of the turning effect of a force.

**Factors affecting Moment or turning effect**

The turning effect depends on two things:

- the magnitude of the force applied

- the perpendicular distance of the force from the pivot.

What is **Pivot**

A pivot is a point around which rotational movement takes place.

**Moment Formula**

moment = force × perpendicular distance from the pivot

M = F × d

Here, M = moment (N m)

F = force (N)

d = perpendicular distance from the pivot (m)

**Moment Unit in SI**

The unit of Moment in SI is Newton meter (N m).

[Note: The unit of force is the newton (N) and the unit of distance is the meter (m).]

Moment example [Spanner use]

The moment is greater if either F or d is increased. For example, to undo a tight nut with a spanner, you need a large moment.

This can be achieved by applying a large force with a spanner.

If a longer spanner is used, a smaller force is needed and it is much easier to undo the nut. The force is applied at a greater distance.

More Examples, where moments are important, include:

- door handles
- see-saws
- cranes
- levers.