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