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Since two weeks ago, I have been working on a project where $n$ things are overlap together (with different coefficients of friction) for getting the force that's need for pulling them apart.

  1. Could you help me? (If all the surface is the same.)

  2. Could you help me? (if we have 2 surface with different COF.)

Overlapping cause a degree (consider that).

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closed as off-topic by Bill N, Colin McFaul, ja72, Norbert Schuch, user36790 Dec 24 '15 at 2:37

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  • $\begingroup$ I think this needs a diagram, if you want a decent answer. $\endgroup$ – Gert Dec 23 '15 at 17:45
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    $\begingroup$ Possible duplicate of Friction forces and sliding slabs $\endgroup$ – ja72 Dec 23 '15 at 19:12
  • $\begingroup$ An answer already exists. $\endgroup$ – ja72 Dec 23 '15 at 19:12
  • $\begingroup$ To which of the items is the force applied? How are the items (masses) positioned? provide a diagram. $\endgroup$ – AHB Dec 23 '15 at 19:13