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.