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Q.Mention the methods used to decrease friction.
Andhra Pradesh BieapBIEAP Intermediate Board (1st Year) 2026Subjective· 4mImportance★★★★★
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Start your 14-day free trial to unlock the full solution →Friction is reduced mainly by making surfaces smoother, separating them with a lubricating film, or replacing sliding contact with rolling contact.
Common methods used to decrease friction:
- Polishing: Smoothing the surfaces in contact reduces the interlocking of surface irregularities, lowering friction.
- Lubrication: Applying oil, grease, or graphite between the surfaces creates a thin film that keeps the solid surfaces from direct contact, greatly reducing friction (this converts solid friction largely into much smaller fluid friction).
- Using ball bearings / roller bearings: Replacing sliding friction with rolling friction (which is much smaller) — e.g. in wheels, machine shafts.
- Streamlining: For bodies moving through a fluid (air/water), giving them a streamlined shape reduces fluid (drag) friction. …
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