Show that the brake in Problem. is self-locking, i.e., P ≤ 0, provided b/c ≤ μs.ProblemThe...

Show that the brake in Problem. is self-locking, i.e., P ≤ 0, provided b/c ≤ μs.

Problem

The block brake is used to stop the wheel from rotating when the wheel is subjected to a couple moment M0. If the coefficient of static friction between the wheel and the block is μs, determine the smallest force P that should be applied.