A wooden block of mass 1.6kg rests on a rough horizontal surface if the limiting friction force between the block and the surface is 8N. Calculate the coefficient of friction. (g = 10ms-2)
A
0.6
B
0.5
C
0.3
D
0.2
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Limiting frictional force is proportional to normal reaction.
but R = normal reaction = mg
mass = 1.6kg
F\(_{\text{lim}}\) = 8N
g = 10m/s\(^2\)
R = 1.6 x 10 = 16N
coefficient of Friction = \(\frac{\text{F}}{\text{R}}\) = \(\frac{8}{16}\) = 0.5.
Source: Myschool Past Questions Archive (Record #33761)