WAEC - Physics (1992 - No. 9)
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 = 10ms2)
0.05
0.20
0.50
0.80
2.00
คำอธิบาย
μ= F/mg = 20/40 = 0.5