Represent body with rotational inertia
The Inertia block represents a rigid rotating body. It rotates about the connected driveline axis, which carries the degree of freedom of motion. The body carries a rotational moment of inertia about that axis, which you specify in the block dialog.
The Inertia block has one port. You can connect it to a driveline axis by
Connecting the port to the end of the axis
Branching a connection line off the main line and connecting it to the port