Consider a block of mass 10 kg released on a rough slope, inclined to the horizontal at an angle of 30 degrees. Its acceleration needs to be determined where the coefficient of friction is 0.2. A free-body diagram of the block is drawn. The forces acting on it are its weight, the normal force, and the frictional force. Using trigonometry functions, the weight of the block can be resolved into parallel and perpendicular components. The normal force is perpendicular to the inclined surface and counteracts the perpendicular component of the weight. To determine the value of the frictional force between the block and the inclined surface, multiply the coefficient of friction by the normal force. The net force is the difference between the gravitational force parallel to the inclined plane and the opposing friction force. It is obtained by substituting their values in the equation. Finally, applying Newton's second law of motion, the acceleration of the block is derived.