For a horizontal surface the horizontal force f to move a solid resting on a flat surface.
Coefficient of friction granite on granite.
F f μ n 1.
The frictional force can be expressed as.
F f frictional force n lb.
For ground surfaces μ reaches a maximum after about 0 1 cm and then decreases to nearly a constant value after 0 5 cm of sliding has occurred.
The second regime includes wet granite above 350 c.
First you tape the low g accelerometer on the end of the surface in this case a slab of granite.
μ static μ s or kinetic μ k frictional coefficient.
Static coefficient of friction.
The coefficient of kinetic friction is generally lower than the coefficient of static friction on the same surface.
The first regime includes dry granite up to at least 845 and wet granite below 250 c.
The friction force is the force exerted by a surface when an object moves across it or makes an effort to move across it.
The coefficients of friction are independent of the surface area in contact.
N normal force between the surfaces n lb there are at least two types of friction forces.
The static friction coefficient μ between two solid surfaces is defined as the ratio of the tangential force f required to produce sliding divided by the normal force between the surfaces n μ f n.
At high confining pressure the coefficient of friction μ for granite depends on the relative displacement of the surfaces.