Answer:
Wind and cord combine, buzzing in the box. In all this we find, though to some the use is lost. What am I?
I am a type of weapon for SCI-FI characters
I help engines spin and pants stay up.
Sometimes I annoy you, sometimes you can't live without me. But no matter how hard you try, you can't destroy me. What am I?
When you need me, you must find me. When you find me, you no longer need me. What am I?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.