turntable and active desktop desktop, the main structure of the turntable is a rolling bearing, from a physical point of view, this is method to reduce the friction between the two desktop, one of the children want to play the disc table, the water to push the turntable square, rotating turntable speed significantly faster, so the friction between the turntable and the desktop (fill in "big change" "small" or "change"), with the increase of putting food on the table, the table rotation sensitivity decreases, the reason is.
(3) with the increase in the activities of the dishes on the table, the quality of the desktop is increasing, so that the gravity increases, stationary objects in the horizontal plane when the gravity is pressure.
The ball bearings are installed in the turntable, and the sliding friction is replaced by rolling friction, which belongs to the reduction of friction;(2) stationary objects in the horizontal plane when the gravity is pressure. The children want to play the disc table, with the horizontal pushing rotating turntable, turntable speed significantly faster, but the friction between the turntable and the same desktop;
Thus the increasing pressure in a certain degree, contact surface roughness, increasing pressure can increase the friction so, with the increase in the activities of the dishes on the table, the sensitivity of active desktop rotation was significantly reduced.The answer is: rolling instead of sliding, constant pressure increases, so that the friction increases
