What is sliding friction and rolling friction.
Since rolling friction is less than sliding friction, sliding friction is replaced with rolling friction in most machines using ball bearings.
Is rolling friction greater than sliding friction?
What is rolling friction? What is the need of converting sliding friction into rolling friction?
Ball bearing is a device which usually converts: (a) rolling friction into sliding friction (b) static friction into sliding friction (c) sliding friction into rolling friction (d) rolling friction into static friction