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 | W par | is less than or equal to the magnitude of the opposing frictional force | F r |. The magnitude of the frictional force, in turn, is proportional to the component of the object’s weight perpendicular to the plane | W perp | (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 | W par |and | W perp | ( Hint: it is not necessary to find W par and W perp first.) b. The condition for the block not sliding is | W par | < μ | W perp |. If μ = 0.65, does the block slide? c. What is the critical angle above which the block slides?
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 | W par | is less than or equal to the magnitude of the opposing frictional force | F r |. The magnitude of the frictional force, in turn, is proportional to the component of the object’s weight perpendicular to the plane | W perp | (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 | W par |and | W perp | ( Hint: it is not necessary to find W par and W perp first.) b. The condition for the block not sliding is | W par | < μ | W perp |. If μ = 0.65, does the block slide? c. What is the critical angle above which the block slides?
Solution Summary: The author explains the magnitude of the vectors W_par and
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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