Essay On Scissors

Scissors is a good design because it helps us to cut anything perfectly instead of tear it. We can use scissors to cut any shapes and length that we need. The design of scissors is according to the concept of simple machine, lever. It is one of the six simple machines identified by Renaissance scientists. A lever is a machine consisting of a beam or rigid rod pivoted at a fixed hinge or fulcrum. There are three types of lever and scissors is classified as first class of levers. The definition of the first class levers is the fulcrum in the middle of the object, the effort is applied on one side of the fulcrum and the resistance on the other side. We just have to apply a small force to cut it down.

The thing that can improve is we can create a movable fulcrum scissors, so that we can change the distance between load and fulcrum to apply different force. According to the law of lever which was proven by Archimedes using geometric

Therefore, we can use less force to lift a heavy object. There are many type of tools use created by this law of lever such as see-saws, crowbars, pliers etc. It is also applied in our body. One example is the joint between the head and the first vertebra.

Another improvement is the changeable cutting edge. There are two types of cutting edge, one is convex edge, the another one is sword edge, also called as bevel edge. These two types of cutting edge have different function. Convex edge is a thin and sharp that allowing the user to employ all cutting techniques, such as sliding, cutting and chipping. Bevel edge is not same angle with the convex edge, thus requiring one or both edges to be corrugated. Corrugations are fine lines or teeth ground into the edge of the blade. It can keep the hair from being push forward by holding the hair. These kinds of scissors are normally found at the low priced barber and beauty