Which is NOT one of the laws of solid friction?
-
A.
The frictional force between two surfaces opposes their relative motion -
B.
The ratio of frictional force to the normal reaction varies for two given surfaces -
C.
The ratio of frictional force to the normal reaction is constant for two given surfaces -
D.
The limiting frictional force is independent of the area of surface in contact. -
E.
Dynamic frictional force is independent of the relative velocity of the surfaces in contact.