A worker pulls horizontally on a rope that is attached to a 10-kg crate resting on a rough floor. The coefficients of static and kinetic friction are 0.5 and 0.3, respectively. The worker pulls with a force of 40 N. The frictional force exerted by the surface is...?? the box is moving because fk<fs If the Fnet is not 50N, the applied force then Fnet= T - fk Fnet= 50N - fk and of cource fk= .3 * 10 * 9.8 = 29.4N Is this right??