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Are there any situations in which the coefficient of kinetic friction is
greater than that of static friction for particular surfaces?
The diagram I give above is the classic textbook diagram for this
question dealing with the case of applying greater and greater force
until an object starts to move. The velocity is irrelevant except that
v>0 defines the kinetic case. This diagram doesn't anticipate the case
where sliding continues without a continuing applied force. In this
case the frictional force is still u_k*N while the block has any v>0.