question_answer

Force required to move a mass of 1 kg at rest on a horizontal rough plane (\[\mu =0.1\] and\[g=9.8\,m{{s}^{-2}}\]) is

A)  0.98 N                 

B)  0.49 N

C)  9.8 N                    

D)  4.9 N

Correct Answer: A

Solution :

                  Given that \[\mu =0.1\]and \[g=9.8\,m/{{s}^{2}}\] So, \[F={{f}_{r}}=\mu N=\mu \,mg\] \[=0.1\times 1\times 9.8=0.98\,N\]