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Message: <blockquote data-quote="Oofta" data-source="post: 7080381" data-attributes="member: 6801845">We have.  The magic of the sphere stops the person from escaping the sphere.Except that it can't be.  Something that has no mass cannot have momentum.  Therefore you cannot transfer momentum through a massless object (assuming the sphere is treated as an object).It doesn't have to.  It's magic.  We know the occupant cannot physically pass through the sphere.  They cannot interact with the ground.  However, if the sphere decelerates to a speed relative to the ground of zero, the occupant is also going to decelerate to a speed of zero relative to the sphere.There doesn't have to be conservation of energy or momentum or any logical consequence that would happen if someone fell onto a physical object.  Why? Because ... repeat after me ... magic is stopping the occupant, not a physical object.In my campaign from a metaphysical standpoint, I would say that the energy behind a spell is pulled from the ether.  The ether surrounds us, some creatures such as dragons naturally pull power from the ether as readily as they breath, magic users pull energy from the ether to power their spells or to create objects.  The momentum of the creature hitting the wall of the sphere is transferred to the ether which transfers an equal amount of force back to the creature.A related question: what would happen if someone jumped from a great height onto a wall of force?  Nothing can physically pass through a wall of force.  You could drop a mountain on top of one and nothing would happen to someone standing underneath.  Yet a wall of force can be free floating.  What happens to the momentum of the falling mountain?  Are you saying that someone that falls onto a wall of force would take no damage?</blockquote>

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