What is limiting friction? State the laws of limiting friction. Define the coefficient of static friction\
Answers
the direction of limiting frictional force is always opposite the direction of motion.
limiting friction acts tangential to the two surface in contact.
Answer:
Both are (top-down) engineering concepts. Both represent heuristic/phenomenological energy loss mechanisms used for mathematical convenience that are without fundamental descriptions. So a relationship between the two is not useful.
Using COF, μ and friction factors, fD lets you describe/predict a system's behavior conveniently and compactly, using mathematical equations and lookup tables. μ describes loss mechanisms in dry solids, and fD in fluids. They serve a mathematically similar purpose, and probably even share a lot of similar physics (both relate to thermal excitation and energy potentials of molecules at the bottom-end), but as engineering concepts, they are not related.