In Ender's game how is fear used as a control

Question

This is a essay so please provide textual evidence or the page numbers with explanation.

Answer 1

The whole idea of battle school's use of fear is summed up pretty well here:

"He toyed with the idea of trying to be like the other boys. But he couldn't think of any jokes, and none of theirs seemed funny. Wherever their laughter came from, Ender couldn't find such a place in himself. He was afraid and fear made him serious."

And the kids themselves use fear to try to control each other -- look at Chapter 12, Bonzo trying to intimidate Ender into backing down.