Sawan presents 121 Plus 9 Physics Experiments (Single Colour) | | Physics Learning Book for kids. Physics is fun! It's all about pushing and pulling, running and jumping, rainbows and rockets &; it's even about sports! Physics involves the sun and the moon and all the things around you, including how you use energy and how animals and plants do, too. This is the book you'll want to use to discover fascinating facts about gravity, light, heat, sound, and other wonders such as thunder and lightning and volcanoes.