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FAQs on Rotational Motion - Theory Sheet, Class 11 Physics - JEE

1. What is rotational motion?
Ans. Rotational motion refers to the motion of an object around a fixed axis. In this type of motion, the object moves in a circular path, and all its particles move in concentric circles about the axis of rotation.
2. What is the difference between translational and rotational motion?
Ans. Translational motion refers to the linear motion of an object, where the object moves along a straight line. On the other hand, rotational motion involves the circular motion of an object around a fixed axis.
3. What is angular velocity?
Ans. Angular velocity is a measure of how quickly an object is rotating or spinning around a fixed axis. It is defined as the change in angular displacement per unit time and is usually denoted by the symbol "ω" (omega).
4. How is angular velocity different from linear velocity?
Ans. Angular velocity and linear velocity are different in terms of their nature. While angular velocity measures the rate of rotation, linear velocity measures the rate of change in position of an object along a straight line. Angular velocity is measured in radians per second, while linear velocity is measured in meters per second.
5. What is moment of inertia?
Ans. Moment of inertia is a measure of an object's resistance to changes in its rotational motion. It depends on both the mass distribution of the object and the axis of rotation. It is denoted by the symbol "I" and is calculated by summing the products of the mass of each particle and the square of its perpendicular distance from the axis of rotation.
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