Figure (10-Q6) shows a smooth inclined plane fixed in a car accelerating on a horizontal road. The angle of incline 9 is related to the acceleration a of the car as

a =g tanθ. If the sphere is set in pure rolling on the incline,




Let’s look into the free body diagram of sphere-


Net force acting on the sphere along the inclined plane-



Now looking into the fig. we have





So, the net force remains zero which means, if the sphere is set in pure rolling on the incline, it will


continue pure rolling.

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