There is a turntable round table. The turntable is installed between the fixed large desktop and the movable desktop. The main structure of the turntable is ball bearing. From a physical point of view, Install ball bearings in the turntable, and replace sliding friction with rolling friction; Belonging to reducing friction;

With the increase of dishes placed on the movable table, the quality of the desktop is also increasing, so it can be seen that its gravity is also increasing, and the gravity of the object resting on the horizontal plane is the pressure at this time. It can be seen that its pressure is increasing, and when the contact surface is rough, increasing the pressure can increase the friction, so with the increase of dishes placed on the movable table, the rotational sensitivity of the movable table is obviously reduced.

So the answer is: reduce friction; With the increase of pressure, the friction also increases.