How Engineers Use Variables to Solve Problems

Crash Course Kids

This educational video introduces students to the critical concept of variables within the engineering design process. Using the relatable framework of asking "What If" questions, the host explains how engineers identify and manipulate different factors to test the success of their solutions. The video distinguishes between variables that can be controlled (like the weight or design of a prototype) and those that cannot (like gravity or wind), providing a clear foundation for scientific testing. The content reviews the standard engineering process—from defining a problem to building a prototype—before focusing specifically on how variables influence outcomes. Through animated examples involving bouncing balls and a hang glider attempting to cross a gorge, the video demonstrates practical applications of these abstract concepts. It emphasizes that identifying variables allows engineers to predict potential failures and refine their designs before real-world implementation. For educators, this video serves as an excellent bridge between general problem-solving and specific scientific methodology. It simplifies the often-confusing topic of variables (independent, dependent, and constants) by framing them as "conditions we can change" versus "conditions we can't." This makes it highly useful for preparing students for science fair projects, STEM challenges, or any unit focusing on experimental design and the scientific method.