Answer by Narv

It looks like you are trying to change the way the force is applied, correct? AddForce has a 2nd optional parameter you can use http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody.AddForce.html It takes a ForceMode. You can control how the force is applied (at once, or continuous) and with or without regard to mass: http://docs.unity3d.com/Documentation/ScriptReference/ForceMode.html