Answer:
I am a sound made by felines when petted.
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
I am heavy forward, but backward I'm not. What am I?
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
I am taken from a mine and shut in a wooden case from which I am never released. Yet I am used by almost everybody. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?