Kids Riddles

Question: There are several different kinds, but the one you pick doesn't do its job.

What is it?

Question: You are in a car with some helium balloons and hit the gas. While you accelerate, which way does the balloon move?

Question: I go up and I go down,
towards the sky and the ground.
I'm present and past tense too,
Let's go for a ride, me and you.

What am I?

Question: You can easily touch me, but not see me.
You can throw me out, but not away.

What am I?

Question: What flies when it's born, lies when it's alive, and runs when it's dead?