MAKE A BOUNCY BALL
these in our
slime time party!
½ c. water
½ t. borax (a laundry booster; can be
found at Walmart and most grocery stores)
2 T. school glue
Stir the water and borax in a cup until
the borax is dissolved. Mix coloring into your glue.
(Tip: Making two or more colors of glue will make a very
colorful bouncy ball!) Drop your glue by the tablespoon into
the borax solution, stirring the glue as it is pouring in. As
the glue hits the solution, it will solidify into a slimy substance.
Now have fish out the glue with your hands. If the glue is still
sticky, dip it into the borax solution over and over until it’s all
solid. The more you handle the slime, the firmer it will become.
Eventually, you will be able to form it into a ball that bounces!
Extension: Make a bouncy
eyeball! Use regular white school glue to make the eye.
Make a smaller batch of blue or green bouncy glue, and an even
smaller batch of dark blue or black. Use the blue or green
blob to make the iris of the eye, and the dark blue or black to make
the pupil! Smush this into your white blob and you have a
Extension: To make a firmer
bouncy ball, mix approx. ½ c. water and approx. 1 t. borax in a cup.
Now put 2 T. of glue into this solution. The slime will be much
firmer this time. Stir it well with a spoon, then take it out and
work it into a ball.
Rubber is made up of long chains of
things called "polymers." These chains are like tiny, twisted
strands of cold spaghetti. When a rubber band is stretched, the
chains uncoil and straighten. When the rubber band is released,
the chains coil up again. This is what makes rubber things
stretchy and bouncy. The chemical reaction in our experiment
today caused the glue to form polymers. Though not technically
rubber, your bouncy ball shares many of the same
ball bounces, it is essentially squishing (when it hits the
ground), then un-squishing (as it pushes back up). Several
variables may make a ball less or more bouncy. One variable is
the composition of the ball itself. Some matter, like rubber for
example, has more spring to it than other matter (like chewed up
Bounciness can also be impacted by how a ball is built. For
example, a soft basketball doesn't bounce as well as one full of
air – even though both are made of rubber and air. That’s
because when a soft basketball hits the ground, the energy gets
spread around more than when a hard, fully inflated basketball
hits – so there’s less upward motion.
Bounciness can also be impacted by the ground. Hard, heavy balls
don’t bounce as well on soft ground because their energy gets
absorbed. But a steel ball will bounce well on a steel floor!
Temperature can impact bounciness by making the material in the
ball softer (heat) or harder (cold), or increasing/decreasing
the air pressure inside the ball (because hot air takes up more
space than cold air).