Falling matter of supernova does "work" heating the core? A supernova core collapses and the rest of the star follows, inner layers arrive first, a shock wave wave forms? As outer layers continue to collapse and slow down is there a large radial time rate change in momentum as rapidly inwardly-flowing matter violently slows down? Does this time rate change in momentum cause a force on the core comparable to the force given by the gravitational force due to mass of accretted outer layers? Do both these forces do work on the core, compress it, and heat it up? In the following video there is a simulation of a supernova core with what I guess is shown either violent motion of the matter of the inner core or pressure waves? Can one assume that the surrounding layers of the star not shown interact with this violent sloshing around by the core? See the 30 second mark. Is this violent motion ultimately "driven" by the outer layers? Thanks for any help!