a) Identify the objects shown in the picture. b) Where are these objects used? c) Do these objects help in increasing or reducing friction? Explain how.
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(a) Ball bearings
(b) Ball bearings are the most common type of bearings and are found in many every day objects, such skateboards, blenders, bicycles, DVD players and photocopiers
(c) Bearings reduce friction by providing smooth metal balls or rollers, and a smooth inner and outer metal surface for the balls to roll against. When the axle rotates the steel balls and wheel rotates in the opposite direction. The two cylinders thus have smaller rolling friction instead of sliding friction. Hence ball bearings reduce friction because they roll rather than sliding producing rolling friction.
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