RigidBody2D.MovePosition - Move local position.

I have a 2D faux gravity planet and player game, I want a way to move the player around the planet smoothly using RigidBody2D.MovePosition on its local x axis. At the moment I'm using rb.AddRelativeForce(Vector2.right movement playerSpeed) but AddRelativeForce is difficult to stop due to the moment from physics, ideally want the player to come to a stop when the right button is released.

Help is much appreciated.