Question

what is the nature of work done by friction?

Answer 1

Friction, by its nature, always acts opposing the relative motion between two surfaces

Answer 2

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Work done by the frictional force is always Negative..

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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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