A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is \[0.2\]. The weight of the block is
AIEEE Solved Paper-2003
A) 20 N
B) 50 N
C) 100 N
D) 2 N
Correct Answer:
D
Solution :
Let R be the normal contact force by wall on the block R = 10N, \[{{f}_{L}}\] = w and \[f=\mu R\] For vertical equilibrium of the block, \[\mu R=w\] \[\Rightarrow \] \[w=0.2\times 10=2\,N\]