Final answer:
Friction can be demonstrated through an inclined plane model. As the angle of the plane increases, the force of friction opposes the component of weight acting parallel to the plane. A simple ramp can be used to observe the point at which an object starts to slide.
Step-by-step explanation:
Friction is a force that opposes motion and can be demonstrated through various models. One of the best ways to demonstrate friction is by using an inclined plane. When an object is placed on an inclined plane, the force of gravity acts downward and the normal force acts perpendicular to the plane. As the angle of the plane increases, so does the component of the gravitational force acting parallel to the plane. This force, known as the component of weight, is opposed by the force of friction, which is directed up the plane.
When the angle of the inclined plane is increased to a certain point, the force of friction becomes equal to the component of weight, resulting in a balance between the forces. This is known as the point of maximum static friction. If the angle is further increased, the force of friction becomes less than the component of weight, and the object starts to slide down the plane due to the force of gravity.
A model that demonstrates this concept is a simple ramp. By placing an object on a ramp and gradually increasing the angle, the student can observe the point at which the object starts to slide. This will help them understand the role of friction in opposing motion.