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jbriggs444
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There is no external horizontal force on the assembly. So its center of mass cannot accelerate horizontally.sysprog said:I don't see how it does that. Can you please elaborate?
Gravity is vertical. No horizontal component.
The normal support force from below is vertical. No horizontal component.
We assume (but are never explicitly told that I recall) that the bottom surface of the big block is free of all friction. No horizontal component.
Any force between top block and big block is internal. It cannot affect the center of gravity.
Any force between the little-blocks, the cord and the pulley is internal. It cannot affect the center of gravity.
Any force between the side block and the big block is internal. It cannot affect the center of gravity.
We do not discuss reactionless drives on Physics Forums.
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