A block of mass m is placed on a rough surface inclined relative to the horizontal. The incline angle is increased until the block start to move. Show that you can obtain the coefficient of static friction μs by measuring the critical angle θ where slipping occurs.

College Physics
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Author:Paul Peter Urone, Roger Hinrichs
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Chapter5: Further Applications Of Newton's Laws: Friction, Drag, And Elasticity
Section: Chapter Questions
Problem 12PE: If an object is to rest on an incline without slipping, then friction must equal the component of...
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A block of mass m is placed on a rough surface inclined relative to the horizontal. The incline angle is increased until the block start to move. Show that you can obtain the coefficient of static friction μs by measuring the critical angle θ where slipping occurs.

my
Solution
Just before slipping, we say that the block is still at rest, so the net force on the x-axis is:
EFx=mg
-f
Evaluating, we get:
= mg
But the frictional force is expressed as the product of coefficient and the normal force so.
Hs
= mg
For an inclined plane. The normal force is
n=mg
Then,
----- -
Transcribed Image Text:my Solution Just before slipping, we say that the block is still at rest, so the net force on the x-axis is: EFx=mg -f Evaluating, we get: = mg But the frictional force is expressed as the product of coefficient and the normal force so. Hs = mg For an inclined plane. The normal force is n=mg Then, ----- -
Then,
Hs=mg
cos(e)
so:
Hs=
tan(0)
Transcribed Image Text:Then, Hs=mg cos(e) so: Hs= tan(0)
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