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 |

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 |

1 Answer - 5876 Votes

3537

**(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