This applet helps teachers and students to study a system in equilibrium under the influence of three forces. An object on an inclined plane is modeled, with the forces weight, normal-reaction, and static-friction depicted. Users can vary the angle of inclination and the weight of the object. The components are shown relative to tilted-axes, the x-axis being parallel to the inclined plane. A check-box toggles the axes. A button toggles the complementary angles. The usual facilities for reset, zoom and drag are enabled.