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3 votes
Which would you expect to have the greatest amount of friction?

a- a smooth surface on a smooth surface
b-a smooth surface on a rough surface
c-a rough surface and air
d-a rough surface on a rough surface

2 Answers

5 votes
D...........................................
User Acadia
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4 votes
D,  this adds the most friction to itself 
User Chanrithisak Phok
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