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Friction

A block of ma...

Question

A block of mass 2 kg rest on a horizontal surface .if a horizontal force of 5N is applied on a block the frictional force on it is (muK =0.4 , muS=0.5)
A) zero
B) 8N
C) 10N
D) 5N

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Solution

Dear student
$A s t h e o b j e c t i s a t r e s t s o i t s a c c e l e r a t i o n i s z e r o a n d h e n c e n e t f o r c e o n t h e p a r t i c l e m u s t b e z e r o . F o r c e a p p l i e d = 5 N s o t h i s i s c o u n t e r b a l a n c e d b y t h e f o r c e o f f r i c t i o n a c t i n g o n t h e p l a n k i n t h e d i r e c t i o n o p p o s i t e t o t h e d i r e c t i o n o f t h e a p p l i e d f o r c e . S o f o r c e o f f r i c t i o n i s = 5 N R e g a r d s$

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