Circular saws are a commonly used tool when it comes to the engineering department. They can be used to cut plastic, wood, and metal, all depending on the blade you choose.
While using a circular saw, it is best to wear safety goggles. Then you select the proper blade and firmly attach it to the saw. After, you plug it into a power outlet. Next, you align the blade to the mark to be cut(but not touching). Then, you slowly, and carefully, follow the cut mark.
https://home.howstuffworks.com/circular-saw.htm
This is related to engineering because circular saws are used to cut metal, wood, and plastic for engineering projects.
