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CBSE Class 11-science Answered

What do you mean by rolling and precessional motion of a rigid body?
Asked by Topperlearning User | 04 Aug, 2014, 02:43: PM
answered-by-expert Expert Answer

Rolling Motion- Rolling motion is a combination of both translatory and rotatory motion about a fixed axis.

                    
The above fig shows a rolling motion of a cylinder. Points,, and.have different velocities at any instant of time. In fact, the velocity of the point of contact is zero at any instant, if the cylinder rolls without slipping.

Precessional Motion- In precessional motion, the axis of the rotation of body does not remain fixed but rotates about a particular direction sweeping out a cone.

                          
In the above fig.it is shown that axis of rotation of the spinning top moves about z-axis through its point of contact O with the ground sweeping out a cone.
Answered by | 04 Aug, 2014, 04:43: PM

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