A force of 20 N applied parallel to the surface of a horizontal table, is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table. (g = 10m/s²)

A. 0.05
B. 0.20
C. 0.50
D. 0.80
E. 2.00

Correct Answer:

Option C – 0.50

Explanation

μ= F/mg = 20/40 = 0.5