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Forces on an inclined plane An object on an inclined plane does not slide, provided the component of the object’s weight parallel to the plane |Wpar| is less than or equal to the magnitude of the opposing frictional force |Fr|. The magnitude of the frictional force, in turn, is proportional to the component of the object’s weight perpendicular to the plane |Wperp| (see figure). The constant of proportionality is the coefficient of static friction μ > 0. Suppose a 100-lb block rests on a plane that is tilted at an angle of θ = 20° to the horizontal.
a. Find |Wpar |and |Wperp | (Hint: it is not necessary to find Wpar and Wperp first.)
b. The condition for the block not sliding is |Wpar| < μ |Wperp|. If μ = 0.65, does the block slide?
c. What is the critical angle above which the block slides?
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Calculus: Early Transcendentals (3rd Edition)
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