One possible option is to use a JavaScript physics engine, such as Matter.js, which is a 2D rigid body physics engine for the web. You can use it to create and manipulate bodies, constraints, composites, and other physical properties. You can also listen to events and control the simulation using methods like engine.run, engine.update, and engine.stop.

Another possible option is to build your own simple 2D physics engine using JavaScript and HTML5 canvas. You can follow this tutorial that walks you through an implementation of a basic physics engine with gravity and collision detection. You can also learn about some concepts and algorithms that are essential for physics simulation, such as vectors, forces, impulses, and separation axes.
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