# 19: Ordinary Differential Equations


In the previous chapter, we found the equilibrium point where a duck would float on water. This kind of problem is called $$static$$ because it does not move. This chapter introduces $$dynamic$$ problems, which involve things that change over time.

Also, you'll learn about a mathematical tool for describing physical systems, differential equations, and two computational tools for solving them, Euler's method andode45 .

But first I have a quick suggestion about organizing code in files.

This page titled 19: Ordinary Differential Equations is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Allen B. Downey (Green Tea Press) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.