Answer:
My voice is tender, my waist is slender and I'm often invited to play. Yet wherever I go, I must take my bow or else I have nothing to say. What am I?
I cause involuntary movements in your vehicle
You can always find me in the past. I am created in the present, but the future can not change me. What am I?
I'm a kind of cup that doesn't hold water, but makes a lot of noise repeatedly. What am I?
I must be broken before you can use me.
What is lighter than what it is made of?