We had an experiment that is entitled "balloon rocket" it is an experiment using the force of balloon to make the straw move. it is about law of interaction.

Did the escaping air have to hit anything to make the balloon move??

my answer here is no, because even in space, space rockets can travel even in a vacuum.

is it correct??

Question

We had an experiment that is entitled "balloon rocket" it is an experiment using the force of balloon to make the straw move. it is about law of interaction.

Did the escaping air have to hit anything to make the balloon move??

my answer here is no, because even in space, space rockets can travel even in a vacuum.

is it correct??

anonymous · Answer

Yes, the best way to put it is every action has an equal and opposite reaction. If air is propelled out of the balloon in one direction, an equal force is applied in the opposite direction making the balloon move forward.

anonymous · Answer

So yes, you are correct.

moongazer · Answer

no, because even in space, space rockets can travel even if the force exerted by the rockets doesn't have anything to hit.
so this is the answer? 
you may improve my answer if i have a wrong grammar

anonymous · Answer

No, because balloons travel using a similar method as rockets, and rockets can move forward even in the vacuum of space where their (fuel? force? particle? can't really think of the right word to put here) output has nothing to hit against.

jamesj · Answer

Pinrose is exactly right -- it's about Newton's 3rd law: every force having an equal and opposite reaction. Here the thrust of the material coming out of the rocket has a force exerted on every single article of gas or other material in that thrust pointing away from the rocket. So there is an equal and opposite reaction the other way on the rocket itself. This might be a bit advanced, but beginning at 24:00 in this lecture, all of this is very nice explained: http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-17/