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Force has Direction and Magnitude

Q.1 A coin of...

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Q.1 A coin of mass m slides a distance D along a tabletop. If the coefficient of friction between the coin and the table is $μ$ , find the work done on the coin by the friction.

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Solution

$D e a r S t u d e n t, F r o m t h e d e f i n a t i o n, ∆ W = f . ∆ x B e c a u s e f o p p o s e s t h e m o t i o n, i t i s d i r e c t e d o p p o s i t e t o ∆ x . T h e m a g n i t u d e o f f i s μ F_{n} = μ m g a n d t h u s W = - μ m g D R e g a r d s$

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