question_answer

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

A) 20 N  

B) 50 N

C) 100 N  

D) 2 N

Correct Answer: D

Solution :

[d] For the block to remain stationary with the wall                        \[f=W\] \[\mu N=W\] \[0.2\times 10=W\Rightarrow W=2N\]