Can the coefficient of static friction be calculated from given information?

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SUMMARY

The discussion centers on calculating the coefficient of static friction for a 10KG block resting on a 30-degree inclined plane. The relationship between static friction, the coefficient of static friction, and normal force is established through the equation: static friction = coefficient of static friction * normal force. While the normal force and static friction can be determined, the coefficient of static friction cannot be calculated directly from the given information, as it represents the maximum static friction, which varies with different forces acting on the object.

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  • Knowledge of normal force calculations on inclined planes
  • Familiarity with the concept of gravitational force
  • Basic principles of classical physics
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A 10KG block is resting on a plane inclined at an angle of 30 degrees from the horizontal. Find the force of frction holding the block stationary. is it possibel to calculate the exact coefficient of static friction from the above information? explain.


for this quesiton, I can find the force of friction. BUT, since:

static friction = coefficient of static friction * normal force

from the above equation we can solve for the exact coefficient right? since we know the normal force & the friction force.

now i know static frition will vary depending on the force acting on the object, but since the block is stationary, and the force of gravity acting on it is constant, which mean the coefficient of static will not change.

why can't we find the the coefficient of static friction?

:confused:

edit- ops...i just noticed...i should have posted in the classcial physics group...err...can some mod help me move this topic there?
 
Last edited:
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Because the coefficient is the coefficient of MAXIMAL static friction,not the coefficient of static friction per se.
 
ahhh......thx.
 

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