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Class 11 Physics Practice Test: System of Particles and Rotational Motion - Rolling Motion
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Avg score: 83% • Most missed: “A disc is undergoing pure rolling motion on a flat surface. The radius of the di…”

Rolling is a type of motion that combines rotation and translation of that object with respect to a surface, such that, if ideal conditions exist, the two are in contact with each other without sliding. Rolling where there is no sliding is referred to as pure rolling.

Class 11 Physics Practice Test: System of Particles and Rotational Motion - Rolling Motion
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14 Questions

1. A solid sphere is given a horizontal velocity of 4m/s on a flat surface. What will be its velocity when it starts pure rolling? Mass = 2kg, Radius = 5cm. Coefficient of friction = 0.3.
2. What is the speed of a point of sphere in contact with the plank, if the sphere is in pure rolling motion in the given diagram? Consider the velocity of the plank to be positive.
3. The diagram given below shows a ring rolling purely on a flat surface, what is the ratio of velocity of points A to point B?
4. What is the displacement of the centre of the wheel in one rotation? Let the radius of the wheel be R.
5. A disc is standing on a flat rough surface. Its centre is suddenly given a velocity of 5m/s in the forward direction. In how much time will pure rolling start? Mass = 1kg, Radius = 10cm. Coefficient of friction = 0.4.
6. Which of the following options is correct for the given diagram? Let the friction coefficient be sufficient for pure rolling.
7. A disc is under pure rolling motion on a horizontal surface. The speed of the topmost point at an instant is 5m/s w.r.t the centre of the disc. What is the velocity of the centremost point? The radius of the disc is 10cm.
8. A ring, disc and solid sphere are left from the top of an incline which has sufficient friction for pure rolling. Which will reach the bottom first, if they all have the same mass ‘M’ & radius ‘R’?
9. A sphere can roll purely on a smooth inclined surface. True or False?
10. A disc is purely rolling down an inclined plane of length ‘l’ & angle θ. What is the value of friction acting on it? Let the mass of the disc be M & radius be R.
11. A disc is undergoing pure rolling motion on a flat surface. The radius of the disc is 5cm & velocity of centre of mass is 10m/s. What is the ratio of kinetic energy as seen from the ground frame to a frame moving along the disc with a speed of 10m/s?
12. A disc is standing on a flat rough surface. Its centre is suddenly given a velocity of 5m/s in the forward direction. In how much time will pure rolling start? Mass = 1kg, Radius = 10cm. Coefficient of friction = 0.4.
13. In the diagram given below what is the direction of friction if the body is in pure rotational motion?
14. The string holding the lift given below is cut. What will be the motion of the ring (as seen from inside the lift) initially at rest on top of the incline? The incline surface is rough.

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