Well, there is a 'Clash Detection' option when running a 'Sequence' of an Assembly, but there is no automatic 'two bodies becoming one' for purposes of simulating one body 'pushing' another. Perhaps as part of some of the analysis routines which uses 'physics' when doing a simulation.
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To an Engineer, the glass is twice as big as it needs to be.
In an assembly, the "move component" command has options for collision detection. But I know of no way to move a component when something collides with it.