## College Physics (7th Edition)

a). coefficient of static friction =$0.8$ b). coefficient of kinetic friction =$0.57$
275N corresponds to static friction, 195N corresponds to kinetic friction. a). coefficient of static friction $=\frac{F_{s}}{mg}=\frac{275}{35\times9.8}=0.8$ b). coefficient of kinetic friction $=\frac{F_{k}}{mg}=\frac{195}{35\times9.8}=0.57$