Feedback on Example 2.4: Including Friction

[philyawj]

In Example 2.4 the visual effect of friction isn't clear.

The goal of showing how to translate a formula into a p5.js force is achieved. However, the large inelastic collision updates in bounceEdges make the small friction force hard to see.

I imagine other readers might have a similar experience. Just wanted to share this in case it's helpful for a future revision.

[shiffman]

My intention is for the user to click the mouse to see the wind in which case the friction gets applied one the ball stops bouncing and rolls to a stop. I will definitely consider helping to clarify this in the future!