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Message: <blockquote data-quote="Oofta" data-source="post: 7079843" data-attributes="member: 6801845">Just to clarify my statement, from my POV the ground is not adding any energy to the equation of the energy of the creature impacting the ground.  All of the energy comes from the momentum of the falling creature.And that is where I think we are splitting hairs.  Yes, normally the ground would exert a force on a falling creature, I don't see that as the ground transferring energy to the creature.In addition, if the sphere has no mass then you can exert no force against the sphere because force = mass X acceleration (a little simplified because force is really a vector).  The sphere has no weight therefore it has no mass.Which is why when the creature inside the sphere has their momentum stopped by the sphere it gets weird.  The momentum should be transferred to the sphere but it can't because the sphere has no mass.So the reason I see no reason to continue is that you haven't explained how it would work. No energy is transferred from the ground to the occupant.  Much like there is no sound in a vacuum, force cannot be transmitted through an object with no mass.  The energy of the momentum of the occupant must be transformed into some other type of energy, much like brakes on your car transform momentum into heat. In my world it would simply dissipate the energy harmlessly back into the ether where all magical energy comes from. But in any case, the occupant would still experience sudden instantaneous deceleration (assuming they have mass).If you're just saying "I would rule this way because magic" that's fine.  I'm trying to understand how it would work while breaking as few laws of physics as possible*.  The only way I can have the occupant never take damage without hand-waving it is to say that when they are in the sphere for all practical purposes they have no mass.  No mass, no momentum, no velocity.  No velocity, no sudden changes in velocity which will cause damage to the occupant.Anyway I apologize for getting frustrated, but if you're going to just insult my intelligence I get a little snarky.*the sphere is basically a force field, and there is no known way to create a force field without breaking the laws of physics.  A force field would have to be akin to the gravitational force, except that it can stop momentum in an instant and with a defined "boundary".  </blockquote>

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