This is a small application developed to demonstrate that gravity still impacts objects in orbit. It is based on a famous thought experiment from Isaac Newton where he imagines shooting a cannon progressively harder until it would eventually be in orbit.
In the app you can also turn off collisions to demonstrate that everyday objects falling to the ground are in orbit around the center of the Earth until they make contact with the ground and are stopped.
You can change the cannonball to a baseball or a basketball. This has no effect on the physics, it's just for fun.