In Fig. 6-58, force is applied to a crate of mass m on a
Chapter , Problem 84(choose chapter or problem)
In Fig. 6-58, force is applied to a crate of mass m on a floor where the coefficient of static friction between crate and floor is ms. Angle u is initially 03 but is gradually increased so that the force vector rotates clockwise in the figure. During the rotation, the magnitude F of the force is continuously adjusted so that the crate is always on the verge of sliding. For ms " 0.70, (a) plot the ratio F/mg versus u and (b) determine the angle uinf at which the ratio approaches an infinite value. (c) Does lubricating the floor increase or decrease uinf, or is the value unchanged? (d) What is uinf for ms " 0.60?
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