Question

WORK DONE BY FRICTION ALWAYS

Answer 1

since friction always opposes the motion of an object, the frictional force's direction will always be opposite to the direction of the motion of the object.

Yes, the work done by friction is negative because it acts against the force applied.

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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