# Motion ## Washer Material Similar to the material of metal used, different types of washers can have drastic effects on the performance of a subsystem. | **Plastic Washer** | **Metal Washer** | | ------------------------ | -------------------------- | | Metal on Metal Contact | Plastic on Plastic Contact | | Metal on Plastic Contact | - | Using plastic washers between two pieces of metal or metal and plastic helps to drastically reduce friction, and provides for a much more smooth rotation. In cases of plastic on plastic contact, metal washers provide the same benefits. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wiki.purduesigbots.com/hardware/misc.-vex-parts-1/motion.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.