Creating a physics simulation with HTML and JavaScript requires a few key components: visual elements (HTML), animations (CSS transitions or JavaScript animations), and logic to control how objects interact (JavaScript). Here's a simple example that meets your requirements:

First, create a container element (<div>) to hold our simulation. You may want to add some CSS styles to make it look more visually appealing:
``` 
#simulation {
  width: 80%; /* Adjust as needed */
  height: 80vh; /* Scale with viewport height */
  background-color: #fafafa; /* Light gray background color */
}
``` 

Next, define the visual elements of our simulated world, including the ground and falling balls. We will use the following HTML structure:
``` 
<!-- Container element -->
<div id="simulation"></div>

<!-- Ground element -->
<svg class="ground" width="100%" height="5">
  <rect x="0" y="0" width="100%" height="5" fill="#ccc" />
</svg>

<!-- Ball elements -->
<svg class="ball" data-radius="20" data-speed="5" data-mass="1" data-count="3" ></svg>
``` 
Note the usage of SVG elements here instead of regular <div> elements because they provide better support for graphics and animation. We also assign custom classes (ground, ball) to organize and style these elements later. Each ball gets an extra data-* attribute with initial values for radius, speed, mass, and count.

Now, it's time to apply some CSS styling to give these elements some shape and positioning. For simplicity, I'll assume you have a basic understanding of CSS selectors and properties. Feel free to adjust colors, font size, and dimensions as desired:
``` 
/* Apply general styles to simulateon container */
.simulateon {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Define global canvas settings */
body {
  margin: 0;
  overflow: hidden;
}

/* Style ground element */
.ground {
  stroke: #aaa;
  fill: none;
  pointer-events: none;
}

/* Style ball elements */
.ball {
  stroke: black;
  fill: white;
  cx: 100%;
  cy: 50%;
  transform: translate(-50%, -50%);
  rx
```
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