Question

generally coefficient of friction value is​

Answer 1

8.4 Friction coefficient

Both static and kinetic COFs depend on the pair of surfaces in contact. Most dry materials in combination have COF values between 0.3 and 0.6. Values outside this range are rare, but Teflon, for example, can have a coefficient lower than 0.04.

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Answer 2

Answer:

A coefficient of friction is defined by the relationship between the force of friction between two objects and the normal reaction between the objects that are involved.It is the minimum force required to get an object to slide on a surface, divided by the forces pressing them together. COF is just a number that indicates how difficult it is to get surfaces to slide past each other.

The formula to calculate the coefficient of friction is μ = f÷N. The friction force, f, always acts in the opposite direction of the intended or actual motion, but only parallel to the surface. N is the normal force. Coefficient of friction is dimensionless therefore having no units