JAMB - Physics (1994 - No. 8)
Calculate the magnitude of the force required to just move a 20kg object along a horizontal surface if the coefficient of friction is 0.2. [g = 10ms-2]
400.0N
40.0N
4.0N
0.4N
解释
F = \(\mu\)mg
= 0.2 x 20 x 10
= 40N
= 0.2 x 20 x 10
= 40N