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78. Pick up wrong statement about friction force for dry surfaces. Friction force is | |
A. | proportional to normal load between the surfaces [Wrong Answer] |
B. | dependent on the materials of contact surface [Wrong Answer] |
C. | proportional to velocity of sliding [Correct Answer] |
D. | independent of the area of contact sur-faces [Wrong Answer] |
E. | none of the above is wrong statement. [Wrong Answer] |