Newton's Cradle is a physics simulation app developed by geekyouup, available on the Android platform for free. With a nice UI, users can drag and drop the balls to create motion or use the accelerometer. The app features multi-touch support for Android 2.0+ and is updated to support Donut 1.6 with QVGA & WVGA.

This app is perfect for those who love physics and want to learn more about it in a fun and interactive way. The app is easy to use and provides a great way to experiment with the laws of motion. The app is suitable for all ages and can be used to teach children the basics of physics. Overall, Newton's Cradle is a great app that provides a fun and engaging way to learn about physics.