1. Cut two equal lengths of thread/string
and tape them to the top of a door frame in the middle about 1
inch or 2.5 cm apart.
2. Blow
up the balloons and tie each end so that the air does not
escape.
3. Tie each of the blown up balloons to
the end of each thread/string so that they are hanging at the same
height and are resting next to each other.
4. Rub each of the balloons with the woolly
jumper/sweater to charge them (one at a time).
What happens when you let them go? How do they react
to each other?
Both of the balloons have become negatively charged once
they have been rubbed with the woollen jumper/sweater and will
push each other away. Items that are made up of the same material
will always take on the same charge. If you have a matching charge
of static electricity in like items, they will repel each other
just like the same poles of magnets will repel each other.
Try to bring the two balloons together after they
have been rubbed with the woollen sweater/jumper. What happens
when you try to bring the balloons together?
Place your hands in between the two balloons,
does something different happen?