When an iPad is unresponsive (doesn't respond to touch / is frozen / acts weird), a "Hard Reset" is probably a good step.
The Hard Reset is like pulling the plug on a standard desktop computer; it forces the iPad to reset everything.
To perform the Hard Reset, press and hold both the Sleep / Wake Button (on the upper right corner) and the Home Button (the round button on the front) until the Apple Logo () appears after the device turns off. This usually takes from 5 - 10 seconds.
