State any four methods of reduce friction.
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Answer:
Friction can be reduced by the following methods ⇒
- by making the surface smooth by polishing.
- by applying lubricants (like oil or grease) to the rubbing surface.
- by using wheels to move objects.
- by using ball bearing between the moving parts of machine.
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1
Answer:
By using lubricants: friction increases as the roughness is surface increases..
polishing surface: it makes the surfaces even and hence refuses friction..
By using ball bearing: Rotating machine can be mounted on ball bearing ..
By streamlining: streamlining reduces the area of contact and thus reduce friction..
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