The Interactive Physics Book Series
This book is available for download with iBooks on your Mac or iOS device. Multi-touch books can be read with iBooks on your Mac or iOS device. Books with interactive features may work best on an iOS device. iBooks on your Mac requires OS X 10.9 or later.
An interactive physics book explaining gravity in a graphically rich and easy to understand manner. This book is intended for use by students wishing to learn physics in an interesting and interactive way as well as for teachers who wish to use it in their physics classes.
What's New in Version 1.3
Added a section on time dilation and fixed a few typos.