the force at which the two surfaces press against one another.In this paper we describe a relatively simple experiment that can be done to test the effect surface temperature has on kinetic friction,and that depending on the materials being used,the coefficient of kinetic friction does indeed increase as the surface temperature of one of the materials increases.Because such effects are not normally discussed in standard introductory physics textbooks,this experiment could be used as a nice inquiry activity in introductory physics courses.