: why when you shake a bag filled with something (like food), the bigger pieces ‘rise’ to the top?

Question

: why when you shake a bag filled with something (like food), the bigger pieces ‘rise’ to the top?

In: Physics

Answer 1

While that is the apparent observation, what is happening is the reverse the bigger pieces aren’t rising instead the smaller pieces are falling leaving the large ones on top.

So you shake the bag and everything leaps up and them falls down with large irregular pieces near to each other they create small irregular holes that the large pieces are too large to fit in and only the small pieces can fit through and fall to the bottom leaving the large pieces occupying the space at the top.