Search results
Results from the WOW.Com Content Network
The coefficient of friction (COF), often symbolized by the Greek letter μ, is a dimensionless scalar value which equals the ratio of the force of friction between two bodies and the force pressing them together, either during or at the onset of slipping. The coefficient of friction depends on the materials used; for example, ice on steel has a ...
The force acting on a point charge due to a system of point charges is simply the vector addition of the individual forces acting alone on that point charge due to each one of the charges. The resulting force vector is parallel to the electric field vector at that point, with that point charge removed. Force on a small charge at position , due ...
Tribology is the science and engineering of understanding friction, lubrication and wear phenomena for interacting surfaces in relative motion.It is highly interdisciplinary, drawing on many academic fields, including physics, chemistry, materials science, mathematics, biology and engineering. [1]
He is best known as the eponymous discoverer of what is now called Coulomb's law, the description of the electrostatic force of attraction and repulsion. He also did important work on friction , and his work on earth pressure formed the basis for the later development of much of the science of soil mechanics .
Contact mechanics is the study of the deformation of solids that touch each other at one or more points. [ 1 ] [ 2 ] A central distinction in contact mechanics is between stresses acting perpendicular to the contacting bodies' surfaces (known as normal stress ) and frictional stresses acting tangentially between the surfaces ( shear stress ).
In static friction there is coupling between elastic strains, polarization and surface charge which contributes to the frictional force. [82] In sliding friction, [108] when asperities contact [38] and there is charge transfer, some of the charge returns as the contacts are released, some does not [109] and will contribute to the ...
In railway applications one wants to know the relation between creepage (velocity difference) and the friction force . Classical results for a true frictional contact problem concern the papers by F.W. Carter (1926) and H. Fromm (1927).
Friction and wear originate at these points, and thus understanding their behavior becomes important when studying materials in contact. When the surfaces are subjected to a compressive load, the asperities deform through elastic and plastic modes, increasing the contact area between the two surfaces until the contact area is sufficient to ...