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Abbas Sen
Asked: 2022-10-29T16:48:04+05:30 In:

A sphere has to purely roll upwards. At an instant when the velocity of sphere is `v,` frictional force acting on it is
image
A. downwards and `mumgcostheta`
B. downwards and `(2mgsintheta)/7`
C. upward and `mumgcostheta`
D. upwards and `(2mgsintheta)/7`

A sphere has to purely roll upwards. At an instant when the velocity of sphere is `v,` frictional force acting on it is
image
A. downwards and `mumgcostheta`
B. downwards and `(2mgsintheta)/7`
C. upward and `mumgcostheta`
D. upwards and `(2mgsintheta)/7`
Parabola
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1 Answer

  1. Correct Answer – D
    In case of rolling in the inclined plane, friction is static and acts in the upward direction and is given by
    `f=(mgsintheta)/(1+(R^(2))/(k^(2)))`………..i
    Form sphere `k^(2)=2/5R^(2)` ……….ii
    Form eqn i andii `f=2/7 mgsintheta` (upwards)

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