It sounds like too difficult to control gravity, but it isn't. It's very simple in truth. All objects have mass. Object which exists mass is source of gravitational field. If you shift an object, then gravitational field of one will be moving with one. To move the gravitational field of the object becomes to change the field condition because different the moving from the unmoving. It could control gravity that the condition of gravitational field is changed by shifting an object. Nobody hasn't shifted any object. So, anybody has controlled gravity before.
It is possible to prove that the gravitational field moves with the object by the following experiment. First of all, assume object P is at position A. Next, object P is shifted to position B. If the gravitational field doesn't move with object, the gravitational field of object P would be at position A instead of position B. By experimentation, we can test that the gravitational field of object Pexists at position B. Why is it so ? It's simple to prove. You can measure the weight of object P at position B.
If you are people who have attempted to understand physics from basic in hard, you would realize that means of shifting object contain very profound problems. Philosophers would insist that shifted things are at position A and B, not object P. I don't want to discuss this matter here. You can refer to the chapter headed,'People who have a considerable knowledge of physics', which explains basic physics systematically. I recommend you to read this chapter if you are technically minded.
Let's go back to the consideration of the motion of a top. A top has mass, and a spinning top has continuous rotational motion. The surrounding gravitational field of the object moves as the object moves. Therefore, it can be said that a rotating top creates a rotating gravitational field. An unrotating top cannot create a rotating gravitational field. This is a physical difference between a rotating top and an unrotating top.
Next, let's go to the chapter, 'Why a top creates movement'.
1.6 Why top makes precession
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