Newton's 3rd law will indeed hold if the
experiment is done on the moon. The balloon will
accelerate as a reaction to the escaping air,
thus: the balloon exerts a force on the air when
it is being released and, at the same time, the
air exerts a reaction on the balloon. You can
perform the following experiment (ask an adult for
help): stand on a skating board (or put on a pair
of skates) on a smooth, level surface.While
standing still, throw a baseball in front of you.
You will notice small recoil backwards (this is
where an adult can help, so you don't fall down).
You don't have to throw it hard; a gentle toss
should do. When you throw the ball, you exert a
force on it. This force is directed forward. At
the same time, the ball exerts a reaction on your
arm that pushes you backward. Notice the opposite
directions between the force applied by your arm,
and the reaction exerted by the ball. Next, try
comparing the reaction when using a lighter ball
and then a heavier ball. Have fun.
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