A 17.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface and the block are 0.720 and 0.510, respectively. A horizontal string is attached to the block and a constant tension is maintained in the string.
What is the force of friction acting on the block if the tension is 11.24 N?
What is the force of friction acting on the block if the tension is 16.24 N?