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.

Slide down the incline as normal will be zero due to free fall

Which of the following options is correct for the given diagram? Let the friction coefficient be sufficient for pure rolling.

Friction is acting in the direction of velocity of centre of sphere

The sphere is in pure rolling motion

Friction is acting in the direction of velocity of centre of sphere

In the diagram given below what is the direction of friction if the body is in pure rotational motion?

Depends on angle on inclination

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?

1:1, kinetic energy is frame independant

14 + Mcqs in Rolling Motion in Physics Page 1 McqOptions

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.
A.	It cannot roll purely
B.	2/3 s
C.	2s
D.	3s
Answer» C. 2s

Discussion

2.	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.
A.	0.25 s
B.	0.05 s
C.	0.5 s
D.	1 s
Answer» B. 0.05 s

Discussion

3.	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.
A.	Pure rolling down the incline
B.	Slide down the incline as normal will be zero due to free fall
C.	Stay at its initial position
D.	Fly upwards
Answer» D. Fly upwards

Discussion

4.	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.
A.	+v
B.	-v
C.	0
D.	-2v
Answer» B. -v

Discussion

5.	Which of the following options is correct for the given diagram? Let the friction coefficient be sufficient for pure rolling.
A.	The sphere is in pure rolling motion
B.	Friction force is zero
C.	The motion is not pure rolling
D.	Friction is acting in the direction of velocity of centre of sphere
Answer» D. Friction is acting in the direction of velocity of centre of sphere

Discussion

6.	A sphere can roll purely on a smooth inclined surface. True or False?
A.	True
B.	False
Answer» C.

Discussion

7.	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’?
A.	Ring
B.	Disc
C.	Solid sphere
D.	All will reach together
Answer» D. All will reach together

Discussion

8.	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?
A.	1:2
B.	2:1
C.	√2:1
D.	1:√2
Answer» D. 1:√2

Discussion

9.	In the diagram given below what is the direction of friction if the body is in pure rotational motion?
A.	Up the incline
B.	Down the incline
C.	Zero
D.	Depends on angle on inclination
Answer» B. Down the incline

Discussion

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.
A.	(Mgsinθ)/3
B.	0
C.	(4Mgsinθ)/3
D.	(2Mgsinθ)/3
Answer» B. 0

Discussion

11.	A ring is at the top of the incline of angle and height ‘h’. If it is left from rest and goes down rolling purely, find its speed at the bottom.
A.	√ (2gh) m/s
B.	√ (gh/sinθ) m/s
C.	√ (ghsinθ) m/s
D.	√ (gh) m/s
Answer» E.

Discussion

12.	What is the displacement of the centre of the wheel in one rotation? Let the radius of the wheel be R.
A.	R
B.	πR
C.	2πR
D.	0
Answer» D. 0

Discussion

13.	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?
A.	1:1, kinetic energy is frame independant
B.	3:1
C.	2:1
D.	1:3
Answer» C. 2:1

Discussion

14.	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.
A.	5m/s
B.	0m/s
C.	2.5m/s
D.	2m/s
Answer» B. 0m/s

Discussion

Explore topic-wise MCQs in Physics.

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.

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.

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.

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.

Which of the following options is correct for the given diagram? Let the friction coefficient be sufficient for pure rolling.

A sphere can roll purely on a smooth inclined surface. True or False?

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’?

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?

In the diagram given below what is the direction of friction if the body is in pure rotational motion?

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.

A ring is at the top of the incline of angle and height ‘h’. If it is left from rest and goes down rolling purely, find its speed at the bottom.

What is the displacement of the centre of the wheel in one rotation? Let the radius of the wheel be R.

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?

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.