Tamilnadu BoardEnglish MediumSTD 8ScienceForces and Pressure.4 Marks
Question
Explain how friction can be minimized.
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Answer
Using lubricants:
A substance, which reduces the frictional force, is called a lubricant. Example: Grease, coconut oil, graphite, castor oil, etc.
The lubricants fill up the gaps in the irregular surfaces between the bodies in contact. This provides a smooth layer thus preventing direct contact between their rough surfaces.
Using ball bearing: Since the rolling friction is smaller than sliding friction, sliding is replaced by rolling with the usage of ball bearings. We can see lead shots in the bearing of a cycle hub.
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