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Chapter: 11th Physics : Motion of System of Particles and Rigid Bodies

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Solved Example Problems for Rolling on Inclined Plane(Rolling Motion)

Physics : Motion of System of Particles and Rigid Bodies : Rolling Motion : Rolling on Inclined Plane

Solved Example Problems for Rolling on Inclined Plane(Rolling Motion)

Example 5.23

Four round objects namely a ring, a disc, a hollow sphere and a solid sphere with same radius R start to roll down an incline at the same time. Find out which object will reach the bottom first.

Solution

For all the four objects namely the ring, disc, hollow sphere and solid sphere, the radii of gyration K are R, √(1/2) R, √(2/3) R, √(2/5) R (ref Table (5.3)). With numerical values the radius of gyration K are 1R, 0.707R, 0.816R, 0.632R respectively. The expression for time taken for rolling has the radius of gyration K in the numerator as per equation 5.63


The one with least value of radius of gyration K will take the shortest time to reach the bottom of the inclined plane. The order of objects reaching the bottom is first, solid sphere; second, disc; third, hollow sphere and last, ring.


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