2019-12-09

There are a couple of things that add friction, one is the roughness of the surface, the weight, and so on, and I'm going to talk about weight today.

Laboratory equipment:

Heavy or small box (tethered)

cord

Spring dynamometer

sandpaper

Experimental design:

The first step is to place the box on the sandpaper and assemble the spring stretcher. The second step is to place the weight on the box. The third step is to pull the spring.

When pressure has nothing to do with gravity, its size has nothing to do with weight

When an object is placed on a horizontal surface and only subjected to horizontal external forces, the pressure of the object on the