Head First Physics is a comprehensive book that makes learning mechanics and practical physics with no pressure. Because it provides a fun, innovative, engaging and inspirational learning experience (rather than another reference book) for students or anyone else to understand the physics indeed. Especially, it will convince you that physics isn't a dry subject with only theory, instead, it's all about the real world we live in.

8 Ball Quick Fire Pool is Miniclip's first-released 2D billiard ball game work with 8-ball rule. It adopts the 90 degree of overlooking view, comes with excellent graphics production and extremely realistic (in fact, it has been the only best currently) sphere collision simulation.

At first glance, you may not believe that this series of small flash games turns out to be full 3D with only 500 KB size for its original .SWF file (designed by A Small Game). In particular, it comes with my favorite two elements: ball + balance with the effects of gravity and collision based on physics.

Super Stacker is a series of physics and gravity based stacking style flash games made by The Game Homepage, comes with challenge and playability. Personally, I always think the balance is a kind of art! And this game provides players with the simplest and most effective way to try it out.

Crush the Castle is a physics and gravity based series of flash games developed by Armor Games - using the stone thrower (heavy catapult) to destroy the castles, which will make you think of the Angry Birds series (but with completely different style).