A block of mass M rests on a rough horizontal | vedclass

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(A) The force of friction is self-adjusting. When an applied force is increased,the static friction first increases linearly with the applied force (a

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(A) The force of friction is self-adjusting. When an applied force is increased,the static friction first increases linearly with the applied force (and thus with time $t$,as the force is steadily increasing) until it reaches a maximum value called the limiting friction.Once the applied force exceeds the limiting friction,the block begins to slide.Since the coefficients of static and kinetic friction are assumed to be equal,the kinetic friction remains constant at the value of the limiting friction.Therefore,the frictional force $f$ increases linearly with time $t$ until the block starts to slide,after which it remains constant. This behavior is correctly represented by the graph in option $A$.

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