A) \[>\frac{a}{g}\]
B) \[<\frac{g}{a}\]
C) \[=\frac{a}{g}\]
D) \[>\frac{g}{a}\]
Correct Answer: D
Solution :
Key Idea: Frictional force between block and board should be dominant, so that the block does not fall. The free body diagram is as follows Force of friction \[=\mu R\] where,\[\mu \]is coefficient of friction and R is normal reaction. Also, \[R=Ma\] Since, mass does not fall, frictional force is dominant. i.e., \[Mg<F\] \[\Rightarrow \] \[Mg<\mu \,Ma\] \[\Rightarrow \] \[\mu >\frac{g}{a}\]You need to login to perform this action.
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