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If you're fascinated by rockets then here's our
guide to building one of your own!
First, you need to think
about how a rocket actually flies?
Imagine you are standing on a skateboard with
your friend in front of you who is also standing on a skateboard.
Now, hold the palms of your hands against the palms
of your friends hands and push.
A rocket orbits Mars |
As you push you will see how both you and your
friend move away from each other.
The scientist Sir Isaac Newton called this the
third law of motion.
He said that every action
has an opposite and equal reaction.
Scientists later used this to make rockets work.
Inside most rockets is an empty tank. Different
fuels are put inside this tank to mix with each other.
When they mix, they explode. The fuel tank has
a hole in one end of it (the bottom end) and when the rocket fuel
explodes, the explosion pushes (creates a force) against the sides
of the tank.
Because the same amount of force goes against
each side, nothing happens. At the same time, the explosion pushes
against the top of the tank but not against the bottom because of
the hole.
Because there is more force against the top end
of the tank than the bottom the rocket reacts by moving in that
direction.
The same thing happens with your rocket. The tablet
starts to fizz when it is put inside the canister. With the lid
on, the fizz creates lots of gas inside but it cannot get out.
Eventually there is so much gas that the lid of
the canister (at the bottom of the rocket) gets blasted off and
the rocket launches into the sky.
Try different amounts of water and different shapes
to the rocket to see what happens. Have fun but be careful!
Make
a rocket and watch it lift off 禄
听
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