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well this science activity is both a puzzle and a science experiment. for doing this you
will require two plastic cups, two plastic balls, rubber adhesive and a pencil. first
place two balls in a plastic cup and apply rubber glue on the entire rim of this plastic
glass. now place the other glass on top of the first one. fix both these glasses mouth
to mouth, press them and let the glue dry for some time. now if i were to ask you how
would you separate the balls without touching them. this might look impossible. but if you
just spin this assembly on the ground, both the balls will go towards the bottom of the
glasses. you can also attach a pencil to this assembly with pitch. now place both the glasses
on the floor and spin them and you will be surprised that both the balls fly outwards
and go towards the bottom of the glasses. on stopping you will find that both the balls
again come close together. you can even hold the pencil in your palm and twirl this assembly.
you will find that both the balls are separated and fly out like a centrifuge