What factors affect coefficient of friction?

The friction force depends on two factors:

• a) The materials that are in contact. The two materials and the nature of their surfaces.
• b) The force pushing the two surfaces together. Pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other.

What is the relation between force and coefficient of friction?

coefficient of friction, ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together. It is usually symbolized by the Greek letter mu (μ). Mathematically, μ = F/N, where F is the frictional force and N is the normal force.

Does friction increase as force increases?

For “dry friction”, such as a box on a floor, it is relatively constant. Why is this? Most objects are microscopically rough with “peaks” that move against each-other. As more pressing force is applied, the peaks deform more and the true contact area is increases proportionally.

Does the coefficient of friction increase when mass increases?

As the mass increases, the static friction increases. This is because the normal force increases as the mass increases.

Does the coefficient of friction depend on normal force?

One more thing, the coefficient of friction is a property of the materials being “rubbed”, and this property usually does not depend on the normal force. In the idealistic model of friction – the coefficient does not change.

Why is the coefficient of friction less than 1?

A value of 0 means there is no friction at all between the objects. This is only theoretically possible. All objects in the real world will have some friction when they touch each other. A value of 1 means the frictional force is equal to the normal force.

Does coefficient of friction change?

No it does not change as the angle changes: the friction coefficient only depends on the nature of the materials in contact.

Why does friction force increase with applied force?

When we increase the applied force (push harder), the frictional force will also increase until it reaches a maximum value. When the applied force is larger than the maximum force of static friction the object will move.