The science of gravity spells.

[Ms Duck]

things are a bit err Squishy on this but maybe what happened is that Harry opened a Picogram sized Black Hole for a Picosecond so that the effect was SPLAT! (and what we "saw" was the result of Harry bending Space/Time how he wanted).


Of course Now since Harry is The Winter Knight and can tap The Winter WellSpring he might decide that an entire BLOCK needs to be flatter.

I could also see Harry making a Staff and Cane combo for when Father Forthill needs to Rebuke Mountains.

nothing happens in either of those scenes that can't be explained by Harry simply 'moving' the weight onto a smaller target.. for a second, the cars weighed much less and the vampire much more.

all he did was transform potential energy into kinetic energy.. much like a water wheel does. It wasn't a gravitational effect, since nothing else was changed.

the thing about gravity is it propagates at either light speed or a bit above it ( it's been measured at 1.5 c, but that's controversial) and since it only decreases with the square of distance (and a very long wave form, maybe) everything should have been squished, not just the vampire.

frankly Harry's a wizard, not a physicist 

[peregrine]

Maybe.  On the other hand, unless Harry has decided to start lying to us about what it is he's actually doing, what he did, because it's what he chose to do, and thought he did, was condense gravity onto a small area.  He's never made any mention of black holes or such.

Also, a tiny black hole wouldn't necessarily have any more gravity than anything else.  A black hole as massive as the sun wouldn't change the gravity of the solar system at all.  A picogram black hole would be no different than a picogram anything else.

[vultur]

Yeah, peregrine is right, a picogram black hole would be totally irrelevant.

nothing happens in either of those scenes that can't be explained by Harry simply 'moving' the weight onto a smaller target.. for a second, the cars weighed much less and the vampire much more.

How is that different from Harry's description? Weight is just force due to gravity.

all he did was transform potential energy into kinetic energy.. much like a water wheel does. It wasn't a gravitational effect, since nothing else was changed.

No, he concentrated force from a large area to a small area.

the effects of the spell match what the weight of a few cars would do, if they were dropped on someone. not megatons.. tons.

Where do the megatons come from? The initial post talks about 10,000 G. A blampire is pretty desiccated, so we're probably talking 100 pounds or less. 10,000 G would then make it weigh 500 tons or less... not millions of tons.

And the spell reduced the vampire to mostly pulp in a fraction of a second. Momentary accelerations of 100 G in crashes are apparently survivable... sometimes, sometimes not (http://en.wikipedia.org/wiki/Orders_of_magnitude_%28acceleration%29#cite_note-nhtsa.dot.gov-7) and Blampires are tougher than humans.