Final answer:
The limiting value of friction is influenced by the coefficient of friction, the normal force, and the area of contact between two surfaces.
Step-by-step explanation:
The limiting value of friction is influenced by several factors. One important factor is the coefficient of friction, which depends on the type of materials in contact. The coefficient of static friction determines the maximum force that can be exerted on an object before it starts to move. The coefficient of kinetic friction, on the other hand, determines the force required to keep an object moving at a constant speed.
Another factor that influences the limiting value of friction is the normal force. Friction is proportional to the normal force, which is the force exerted by a surface perpendicular to the contact area. When the normal force increases, the frictional force also increases.
Finally, the area of contact between two surfaces can also affect the limiting value of friction. Contrary to intuition, the frictional force is not directly proportional to the area of contact. When two rough surfaces are in contact, only the high spots touch, resulting in a smaller actual contact area. However, as the normal force increases, the actual contact area also increases, leading to an increase in friction.