Answer:
I cause involuntary movements in your vehicle
Alone I am 24th with a friend I am 20. Another friend and I am unclean.
You hold my tail while I fish for you. What am I?
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
What is made of water but if you put it in water it will die?
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.