When to Call It a Pure Translation

Q. 12.A wheel of radius R is place on ground and its contact point is P. If wheel rolls down without slipping completing half a revolution, find the displacement of point P.

Q. (A)In rolling all points of a rigid body have the same linear speed (R) the rotational motion does not affect the linear velocity of rigid body

Q. A wheel of radius R rolls forward half a revolution . The displacement of a point which is at height R from the point initially in contact to ground is

Q. 129.When an object is in motion in a vertical circle its tension at the lowest point is

Q. A particle stays at rest as seen in a frame. We can conclude that
(a) the frame is inertial
(b) resultant force on the particle is zero
(c) the frame may be inertial but the resultant force on the particle is zero
(d) the frame may be non-inertial but there is a non-zero resultant force

Q.

An object is in combined rotational and translational motion. Its K.E. is

1. 

2. 

3. 

4. 

Q.

Which of the following is/are necessary and sufficient condition(s) for pure translation?

1. The relative position of particles of the body does not change with time.

2. Velocities of all the particles are parallel to each other at any given instant.

3. A body always remains parallel to itself throughout its motion.

4. Velocities of all the points of the body at any instant of time are equal.

Q. A box is being pushed on a horizontal surface. What kind of motion it performs?

1. Pure translation
2. pure rotation
3. Pure rotation and translation
4. neither pure rotation nor pure translation

Q.

Give an example of one dimensional motion where a particle moving along the positive x-direction comes to rest periodically and moves forward

Q.

Explain why friction is necessary to make the disc in Fig. 7.41 roll in the direction indicated.

(a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins.

(b) What is the force of friction after perfect rolling begins?

Q. is the motion of centre of mass required only in translational motion?

Q. What do you think is the type of the motion performed by a duster around a fixed axis as disucced by Aanand in the previous video clip?

1. Pure Translation
2. Pure rotation
3. Pure rotation and translation
4. Neither pure rotation nor pure translation