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Introduction

We have all seen and experienced some form of gyroscopic motion but probably have never given the phenomena much thought. What is a gyroscope? A broad definition would be, ``a solid body capable of rotating at high angular velocity about an instantaneous axis which always passes through a fixed point'' which sounds like that toy top you may have enjoyed as a child. The interesting thing about the familiar toy top is that it incorporates all those rotational motion elements that we might have studied in a typical engineering dynamics class. Now imagine the top is spinning on a horizontal surface. We notice that it moves around, but how does it do this? The explanation for this motion might look very straight forward as simply being due to the steady downward force of gravity acting on the top, Well this is only part of the story! Actually torque and angular momentum have significant roles as we will see. The top movement or skewing around of the spin axis is called precession and is dependent on the direction of the top and on which end the force is applied.



Anirudh Modi
1/2/1999