Which is NOT one of the laws of solid friction?

Question 1 Report

The frictional force between two surfaces opposes their relative motion

The ratio of frictional force to the normal reaction varies for two given surfaces

The ratio of frictional force to the normal reaction is constant for two given surfaces

The limiting frictional force is independent of the area of surface in contact.

Dynamic frictional force is independent of the relative velocity of the surfaces in contact.

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