# A sphere is placed rotating with its centre initially at rest in a corner as shown in figures (a) and (b). Coefficient of friction between all surfaces and the sphere is 1/3. Find the ratio of the friction forces  by ground in situation (a) and (b) a) 1 b) c) d) None of these

## Question ID - 100233 :- A sphere is placed rotating with its centre initially at rest in a corner as shown in figures (a) and (b). Coefficient of friction between all surfaces and the sphere is 1/3. Find the ratio of the friction forces  by ground in situation (a) and (b) a) 1 b) c) d) None of these

3537

Answer Key : (b) -

(b)

In figure, for translational equilibrium in vertical direction

In horizontal direction

…(ii)

Solving.Eqs. (i) and (ii),

The required friction is

In figure, the sphere has the tendency to move toward the right;

Which gives

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