First slide
Rolling motion

A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?


 Required work done =-Kf-Ki=0+Ki=Ki =122+12mv2=1212mR2ω2+12mv2 =34mv2=34×100×20×10-22=3 J

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