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Ball bearings are fitted between the moving parts of a ceiling fan. They help because:
Which of these is a DISADVANTAGE of friction?
Grease and oil applied between moving parts of a machine increase the friction between them.
Why is fine powder sprinkled on a carrom board before playing?
Why do athletes wear shoes with spikes, and why do tyres of vehicles have grooves (treads)?
Riya cycles 3 km to school every day. Her father oils the chain and the axles of her bicycle every Sunday. On a dry, sandy stretch of road she finds pedalling much harder than on the smooth tar road. When she presses the brakes, the brake rubber pads press against the wheel rims and the bicycle slows down.
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