Manual Part 2

50
You need a comb (or plastic
ruler) and a water faucet for this
part. Run the comb through your
hair several times then hold it
next to a slow, thin stream of
water from a faucet. The water
will bend towards it. You can
also use a plastic ruler. Rub it on
your clothes (wool works best).
Find a comb (or plastic
ruler) and paper. Rip up the
paper into small pieces. Run
the comb through your hair
several times then hold it near
the paper pieces to pick them
up. You can also use a pen
or plastic ruler, rub it on your
clothes (wool works best).
Notice how your hair can
“stand up” or be attracted to
the comb when the air is dry.
How will this change if you
wet your hair? (Try it.)
Rubbing the
comb through
your hair builds
up a static
electrical charge
on it, which
attracts the
water.
Rubbing the comb
through your hair pulls
electrons from your
hair onto the comb.
These give the comb
a static charge, which
attracts the paper.
Take a piece of newspaper or other
thin paper and rub it vigorously with a
sweater or pencil. It will stick to a wall.
Cut the paper into two long strips, rub
them, then hang them next to each other.
See if they attract or repel each other.
Rub two balloons on a sweater and hang
the rubbed sides next to each other.
They repel away. You could also use the
balloons to pick up tiny pieces of paper.
Opening the oven door to check on food that is baking will let heat escape, making the oven work harder. It is better to use the oven light.