What about AddForce and AddAbsForce?
The Wiki wrote:
 AddForce
Adds force to this MovableObject for the next time Update() is called.
Arguments:
    * An Vector with the external force vector that will be added to this
    * MovableObject and affect its path next Update(). In N or kg * m/s^2.
    * A Vector with the offset, in METERS, of where the force is being applied relative to the center of this MovableObject. 
For velocity you'd have to do a few calculations to get from force to m/s, but other than that.