a body of masses is falling freely under gravity express the frictional force f what will be its acceleration before and after the force of friction acts on it. do they depend upon mass of the body

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Solution

$w h e n b o d y f a l l s f r e e l y t h e n a c c e l e r a t i o n i s d u e t o g r a v i t y w h i c h i s g . W h e n f r i c t i o n a f o r c e a c t o n t h e b o d y i n u p w a r d d i r e c t i o n w h i c h i s g i v e n b y : f = m a w h e r e m i s t h e m a s s o f t h e b o d y a n d a i s t h e a c c e l e r a t i o n d u e t o f r i c t i o n . n e t a c c e l e r a t i o n = g - \frac{f}{m} y e s t h i s a c c e l e r a t i o n d e p e n d s o n t h e m a s s o f t h e b o d y .$

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