| force | The force to add to the X component of the velocity in the local space of the Rigidbody2D. |
| mode | The method used to apply the specified force. |
Adds a force to the X component of the velocity in the local space of the Rigidbody2D only leaving the Y component of the local space velocity untouched.
Additional resources: Rigidbody2D.AddRelativeForceY and Rigidbody2D.AddRelativeForce.