Excessive dependence on the formulae to deal with a physical process can sometimes obscure the physics of the process.
By observing the change in the behavior of objects when some parameter governing their behavior changes, physics of the process can come home.
This app is a part of collection of apps on introductory physics.
The other physics apps can be found on the playstore at
Desktop java applets dealing with this content are available for free at this website
http://www.surendranath.org (General Physics Java Applets)
Some of these applets have been reviewed on merlot. Please check the following link.
Some related videos can be found here.