Question

Work done by frictional force

Answer 1

will equal to work done by object but in opposite direction or -

Answer 2

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Work done by the frictional force is always Negative..

$\huge\boxed{\texttt{\fcolorbox{red}{aqua}{Explanation:-}}}$

It is because the frictional force always acts in the opposite direction to the motion...

So angle between the displacement and the Force(Frictional force) become 180...

So

W=F.s.cos 180

W=-F.s

⇒Points To Be Noted

• Work done is dot product of the force and displacement.
• The value of cos 180 is -1
• Frictional force always act in the opposite direction to the Motion...

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