- Exam
- JEE Advanced
- Year
- 2021
- Paper
- Paper 1
- Subject
- Physics
- Chapter
- Rotational Motion
JEE Advanced 2021 · Paper 1 · Physics · Rotational Motion
A horizontal force F is applied at the centre of mass of a...
A horizontal force is applied at the centre of mass of a cylindrical object of mass and radius , perpendicular to its axis as shown in the figure. The coefficient of friction between the object and the ground is . The centre of mass of the object has an acceleration . The acceleration due to gravity is . Given that the object rolls without slipping, which of the following statement(s) is (are) correct?
Options
- AFor the same , the value of does not depend on whether the cylinder is solid or hollow.
- BFor a solid cylinder, the maximum possible value of is .
- CThe magnitude of the frictional force on the object due to the ground is always .
- DFor a thin-walled hollow cylinder, .
Correct answer
B. For a solid cylinder, the maximum possible value of is .
Step-by-step solution
Let moment of inertia
For pure rolling,
and
and
or
or
Therefore,
For the same value of , value of depends on .
For a solid cylinder\left(I = \dfrac{m{R}^{2}}{2}\right)af = \mumg∴ \mumg = \left(\dfrac{m{R}^{2}}{2}\right) \times \dfrac{a}{{R}^{2}}a = 2\mug⇒ f⇒,