The phrase "friction exist" is not grammatically correct in written English.
The verb "exist" is singular, so it needs to be paired with a singular subject. The correct phrase would be "friction exists." You can use this phrase when discussing a concept or idea that involves friction. For example: "Friction exists between the two countries due to their conflicting political beliefs." In this sentence, "friction exists" means that there is tension or disagreement between the two countries.
But friction existed between the two schools.
It's not hard to fathom why friction exists between practitioners of fine art and fashion photography.
The paper also demonstrates that torque oscillations can be completely eliminated, even when motional friction exists and only a small constant torque is required to overcome friction.
It is found that, as feed increases, the radial force increases therefore more friction exists between newly generated surface and the flank face so surface roughness increases.
Most striking about this scene is not that such friction exists between city and shopkeeper over sidewalk space, or that language and cultural barriers remain so impenetrable between the police and the policed in 21st-century Manhattan, or that a sizable chunk of a store's inventory can be seized so swiftly.
The main advantages of separate GAM are those that derive from having unified rather than shared control of the customer relationship: No friction exists between global and local operations; account information is easier to manage; and customers often receive better service, because the employees assigned to them by the supplier are not also serving local accounts.
Numerical results show that the axial, radial, circumferential and shear strains are all inhomogeneous within finite cylinders, and local strain concentrations near two end surfaces were usually developed as long as friction exists between end surfaces and loading platens.
Too much friction existed between innovators and potential licensees.
The banks (and small businesses) that are thriving are constantly looking for ways to reduce friction for clients and customers who aren't yet aware the friction exists.
Kinetic energy of missile is dissipated by strain energy of yarns in places where slipping friction exists.
