Introduce lever and explain its working principle

It has been found by experiment that two equal forces acting in opposite directions, i.e., clockwise and counterclockwise, and applied to a uniform lever at equal distances from the fulcrum counteract each other and establish a state of equilibrium, or balance, in the lever.

reading poetry is challenging when you don't have or very little of social context and culture schema.

solution: read the introduction, the norm, or even explaination if you still dont get it.