When to Call It a Pure Translation

Q.

Centripetal force is present in both inertial and non inertial frame of reference then how centrifugal force is only present in non inertial frame of reference, it simply means that it is absent in inertial frame of reference , is it true?

Q. What are the characteristics of Simple Harmonic Motion?

Q.

A corkball and a tennis ball have same size and shape. Both are pressed with same force. This compresses the tennis ball but the cork ball is not compressed at all. Which of the following statement is true from the above context?

1. Cork Ball is rigid-body but tennis ball is a non-rigid body.

2. Tennis ball is rigid-bodybut cork ball is a non-rigid body

3. Both are rigid body

4. Both are non-rigid body

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

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

Q.

Which of the following statement is true?

1. Newton's laws can be applied to all the particles of an object in an inertial frame.

2. Newton's laws can be applied only for isolated point masses.

3. Newton's laws can be applied only for/at centre of mass (COM) of any object.

4. Newton's laws can be applied in a non-inertial frame

Q. Tell about projectile motion

Q. A ball rolling on the ground in a straight line has
(a) rectilinear motion.
(b) rectilinear and rotational motion.
(c) rectilinear and curvilinear motion.
(d) rectilinear and periodic motion.

Q.

What is maximum number of rectangular components into which a vector can be split in its own plane

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

Q.

A corkball and a tennis ball have same size and shape. Both are pressed with same force. This compresses the tennis ball but the cork ball is not compressed at all. Which of the following statement is true from the above context?

1. Cork Ball is rigid-body but tennis ball is a non-rigid body.

2. Tennis ball is rigid-bodybut cork ball is a non-rigid body

3. Both are rigid body

4. Both are non-rigid body

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. Which of the following statements is incorrect?

1. A fan is rotating about a fixed axis then net torque on the fan may be zero.
2. Moment of inertia of particle about an axis depends on perpendicular distance from the axis.
3. For equilibrium of a rigid body net force & net torque must be zero.
4. For a large cubical box sliding down a rough inclined plane normal force on box must pass through center.

Q. A body is given transitional velocity and kept on a surface that has sufficient fraction. Then:

1. body will move forward before pure rolling
2. body will move backward before pure rolling
3. body will start pure rolling immediately
4. None of the above

Q.

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

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

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

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. Assertion :A concept of pseudo forces is valid both for inertial as well as non-inertial frame of reference. Reason: A frame accelerated with respect to an inertial frame is non-inertial frame.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

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. The quantity not involved directly in rotational motion of the body is?

1. Moment of inertia
2. Angular velocity
3. Torque
4. Mass

Q.

1. only under special conditions
2. never
3. in all situations
4. in space only

Q. In rear-wheel drive cars, the engine rotates the rear wheels and the front wheels rotate only because the car moves. If such a car accelerates on a horizontal road, the friction :

1. on the rear wheels is in the forward direction.
2. on the front wheels is in the backward direction.
3. on the rear wheels has larger magnitude than the friction on the front wheels.
4. on the car is in the backward direction.

Q. Two children are playing with a roll of paper towels. One child holds the roll between the index fingers of her hands so that it is free to rotate and the second child pills at constant speed on the free end of the paper towels. As the child pulls the paper towels, the radius of the roll of remaining towels decreases.
How does the torque on the roll change with time?

Q. Statement 1: When a sphere rolls on a horizontal table it slows down and eventually stops.
Statement 2: When the sphere rolls on the table, both the sphere and the surface deform near the contact. As a result, the normal force does not pass through the centre and provide an angular deceleration.

1. Statement 1 is false, Statement 2 is true
2. Statement 1 is true, Statement 2 is true; Statement 2 is a correct explanation for Statement 1
3. Statement 1 is true, Statement 2 is true; Statement 2 is not a correct explanation for Statement 1
4. Statement 1 is true, Statement 2 is false

Q. Motion of a pendulum bob is an example of:

1. one dimensional motion.
2. three dimensional motion.
3. two dimensional motion.
4. none of the above.

Q.

A corkball and a tennis ball have same size and shape. Both are pressed with same force. This compresses the tennis ball but the cork ball is not compressed at all. Which of the following statement is true from the above context?

1. Both are rigid body

2. Both are non-rigid body

3. Cork Ball is rigid-body but tennis ball is a non-rigid body.

4. Tennis ball is rigid-bodybut cork ball is a non-rigid body

Q.

Which of the following is the necessary and sufficient criterion for a body to be called rigid?

1. The relative position of any two point particles of the body do not change as time passes.

2. The body does not move at all with respect to any stationery frame.

3. All the points of the body move with the same speed.

4. The body does not respond to any amount of external force applied in any way.

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.