1. Fill your
soda bottle with water leaving just
a bit of a space (gap) at the top.
2. Cut a piece of straw 2 inches
3. Pull the two rounded ends
of the paper clip apart slightly
4. Bend your straw in half and
push the rounded ends of the paper
clip into the opened ends of the straw.
5. Open the small paper clip
to make a hook and wrap it around
the center bit of the paper clip that
is in the straw ends.
6. Take some play dough and
wrap it around the middle bit of the
first paper clip. This is to give
your diver a bit of weight. Make sure
you get the balance right so that
your diver will float at the top of
7. Cut a piece of string around
3 inches long.
8. Roll out a good bit of play
dough so that it will easily fit into
the mouth of the bottle and heavy
enough to sink to the bottom of the
9. Tuck both ends of the string
into this play dough securely and
drop into your bottle.
10. Screw the lid on to the
11. Place a hand or both hands
around your bottle and apply a bit
12. Does your diver sink?
See photos below.
Have a play and see what works best.
Should you apply pressure at the top
part of the bottle?
Does it work better if you apply
pressure at the middle of the bottle
or the bottom of the bottle?
Challenge yourself and friends to
see how many attempts it takes to
hook the loop at the bottom?
Experiment with different materials
from around the house. Come up with
different types of Cartesian Divers.