# Calculate moment for floating body

Hi

I have a floating body. I want to calculate force and moment applied to this body.

The floating body is allowed to rotate around an axis (2D simulation).

The command "computeforces" calculates the forces correctly.

I have added momentaxis:0:0.1:0.0:0:-0.1:0.0 for computung the moment. But I face the following error:

... Force moment calculation is invalid for floating forces

What is the solution?

## Comments

We are going to include this functionalitiy in v5.0 since we, the developers, and other users like you we need that for different applications.

Thanks