collision help wasted alot of time

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i trying to re create this


https://www.youtube.com/watch?v=PVMjD3_RsP8

1: body tyflow1 added screws
2: tyflow2 falling nails.

tyflow1 object bind + position object selected the human body
tyflow2 object bind + position object selected the human body

is this why body is not colliding with the particles already sitting on ground.
in this video you can se as he moves left and the right the particles go flying out of the way this is what i want to do what am i doing wrong.