Rotation About a Fixed Axis

Let us consider a rigid body rotates about any fixed axis whose particles follow circular path. In this condition, the particles of the rigid body possess zero velocity and zero acceleration on this fixed axis of rotation as shown in Fig. 3.2 (a),


Rotation About a Fixed Axis 1” = C</p

Considering the Fig. 3.2 (b), it shows the angular positions of two lines


Rotation About a Fixed Axis 2” = C</p

From the above figure, we can write-

12 =

As angle  is for rigid body motion, it cannot be changed. So its differentiation w.r.t time is zero, i.e.,

12 = 0



This implies that change in angular displacement will remain same for all lines on the rigid body. Similarly, the angular velocity and angular acceleration will also be same.


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