Answer:
I am the noblest musical instrument
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
What comes in many different sizes but is always only 1 foot long?
I am the word that has three syllables and twenty six letters.
You kick me, you punch me, and you beat me up all class. When you leave, you don't even say thanks for allowing you to beat me up. What am I?
What is always coming but never arrives?