## Kinematics of Rotational Motion – Class 11 | Chapter – 7 | Physics Short Notes Series PDF for NEET & JEE

Kinematics of Rotational Motion: Kinematics of rotational motion refers to the study of the motion of objects that rotate about an axis. In contrast to linear motion, where position is described by a single coordinate, rotational motion requires two coordinates to describe the position of an object – the angle of rotation and the distance from the axis of rotation.

## Quantities Used in Kinematics of Rotational Motion

The basic quantities used to describe the kinematics of rotational motion are:

• Angular displacement: The change in angle through which an object rotates. It is usually measured in radians (rad).
• Angular velocity: The rate of change of angular displacement with respect to time. It is usually measured in radians per second (rad/s).
• Angular acceleration: The rate of change of angular velocity with respect to time. It is usually measured in radians per second squared (rad/s2).

## Formulas in Kinematics of Rotational Motion

Angular displacement:

θ = ω0t + ½αt2

Where,

• θ is the angular displacement
• ω0 is the initial angular velocity
• t is time
• α is the angular acceleration

Angular velocity:

ω = ω0 + αt

Where,

• ω is the final angular velocity
• ω0 is the initial angular velocity
• t is time
• α is the angular acceleration

Angular acceleration:

α = (ω – ω0)/t

Where,

• α is the angular acceleration
• ω is the final angular velocity
• ω0 is the initial angular velocity
• t is time

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