Question

anyone knows physics???

Answer 1

ya i do!!!!

Answer 2

wow u know

Answer 3

???

Answer 4

y do u ask this where is the question!!!!!

Answer 5

k its about friction

Answer 6

u know problems in it???

Answer 7

whats the question?

Answer 8

k???? then write the question!!!

Answer 9

increasing area of contact should increase the actual microscopic area of contact despite this the coefficient of friction is independent of area of two surfaces explain

Answer 10

newton does

Answer 11

coefficient of friction is an empirically determined system property. It is independent of the surface area.

Answer 12

xplain

Answer 13

plz

Answer 14

i need a good answer

Answer 15

the friction between two surfaces = Rm where m = coefficient of friction and R is the normal reaction between the surfaces

Answer 16

The frictional force is independent of the macroscopic area of contact between the surface. What determines the amount of adhesion is the microscopic contact area. The microscopic area of contact is pretty much independent of whether the object rests on it's larger or smaller face. The object only makes contact with the surface at the tips of the irregular protuberances projecting from its surface; the normal force squeezes the protuberances of one surface against those of the other and these protuberances deform to some extent so that they mate more closely with one another. When the object rests on a larger face, the number of contacting protuberances is larger than when it rests on a small face, but since the normal force is distributed over a larger number of such protuberances, the deformation of each is less than when the object rests on a small face. Thus in one case there is a large number of contacting protuberances, each involving a small area; and in the other case there is a somewhat small number of contacting protuberances, each involving a somewhat larger area. The net result is that in both cases the sum of all the microcontact areas is the same and, consequently, the friction force is the same.

Answer 17

Keep in mind that the simple empirical law for friction is only approximately valid.

Answer 18

wow all that effort and no medal?