Samsung Galaxy Tab 2 7.0 (WiFi User Manual page 21

Flick
Briskly scroll up, down, left, or right to
move through lists or screens.
Pinch
Place two of your fingers far apart,
and then pinch them together.
Your device turns off the touch screen when you do
●
not use it for a specified period. To turn on the screen,
press the Power key.
You can set the length of time that the device waits
●
before turning off the screen. In the application list,
select Settings → Display →
Getting started
21
Screen timeout.