Ask your friend to hold the other end
of the thread or fix it on a wall at some distance.
This arrangement is shown in the
figure.
Now remove the thread tied on the neck
of balloon. Let the air escape from the mouth of the balloon. Observe the
direction in which the straw moves. Give reason.
Answer:
The
straw moves in opposite direction of air because when the air is released out
of the balloon and imparts momentum to the straw.
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