Solved: In Fig. 6-58, force F is applied to a crate of
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In Fig. 6-58, force F is applied to a crate of mass 111 on a floor where the coefficient of static friction between crate and floor is ILs' Angle B is initially 0 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 ILs = 0.70, (a) plot the ratio Fll11g versus Band (b) determine the angle Binf at which the ratio approaches an infinite value. (c) Does lubricating the floor increase or decrease Binf, or is the value unchanged? (d) What is Binf for ILs = 0.60?
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