The force pressing two stacked objects together is equal to the weight of the object on top. the friction between a piece of wood on a stone surface is 22.5 newtons. the same piece of wood is placed on another surface, and the friction between the wood and the surface is now 46.5 newtons.
what could be the second surface?
a) metal
b) concrete
c) brick
d) skin
Answers: 2
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