What are the equations for static and kinetic friction?

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SUMMARY

The discussion focuses on the equations for static and kinetic friction, specifically addressing a box at rest on a horizontal surface. The static friction equation is defined as Fs = musFn, while the kinetic friction equation is fk = mukFn. The solution emphasizes the importance of drawing a free body diagram to visualize forces and understand the conditions under which applied force (Fapp) does not equal frictional force (Ff).

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Homework Statement



A box firstly at rest on a horizontel surface, needs a horizontal force to get it in motion. Though after in motion the box needs a force to keep in speed. Find static and kinetic coefficient of frictions.

Homework Equations



fk=mukFn
Fs=musFn

The Attempt at a Solution



I solved!
 
Last edited:
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Try drawing a free body diagram so you can see everything a little bit more clearly. After that, just try and figure out what you need to meet the specifications of your problem. If the forces are unbalanced, Fapp does not equal Ff.
 

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