This activity introduces students to frictional forces, the coefficient of static friction, and the coefficient of kinetic friction by using a free online simulation available through Phet.colorado.edu. The activity walks students through five different scenarios of pushing, then sliding, various objects over a flat surface. The simulation allows different graphs to be displayed by clicking a check box. The graph options are acceleration vs time, velocity vs time, and position vs time. With this activity students begin to understand how different objects have different frictional forces (coefficients of friction) acting on them.