Answer:
Never ahead, ever behind, yet flying swiftly past; For a child I last forever, for adults I'm gone too fast.
Not a comb or a brush but makes the hair feel plush. What is it?
What instrument can make any sound and be heard but not touched or seen?
This is a shape and a symbol that we literally cannot live without. What is it?
What is the center of gravity?
What sphinxes employ and players enjoy.