# Body:getInertia

Gets the rotational inertia of the body.

The rotational inertia is how hard is it to make the body spin. It is set with the 4th argument to Body:setMass, or automatically with Body:setMassFromShapes.

## Function

### Synopsis

    inertia = Body:getInertia( )

### Arguments

None.

### Returns

`number inertia`
  The rotational inertial of the body.

## See Also

- Body

##

Category:

- Functions