An object with a mass of #12 kg# is on a plane with an incline of # - pi/6 #. If it takes #6 N# to start pushing the object down the plane and #4 N# to keep pushing it, what are the coefficients of static and kinetic friction?
1 Answer
coefficient of static friction
coefficient of kinetic friction
Explanation:
the incline is making an angle of
the forces operating on the body is the weight m.g vertically
down =
the normal reaction of the plane acting perpendicular to the plane. say R
breaking the weight in components along the plane and
perpendicular to the plane inclined at 30 degree to horizontal
mg. sin30 will act along the plane .
as a force of 6 N is needed to start the motion
so frictional force f s = 6 N + mg sin 30 = 6 N + 120/2 = 66 N
however ,when the body starts moving a force of 4 N is sufficient to maintain the motion , therefore