This lesson requires 3 balloons, one paperclip and two plastic straws.
Thread, scissor and tissues or paper towels are not provided.
Students discover that objects with opposite charges attract,
while objects with like charges repel. Simulations and questions follow.
to the image on the next slide.
and tie
the balloon.
to watch as you rub
the balloon vigorously
on your hair.
Be sure your hair
is clean and dry.
THIS WORKS BEST
IN DRY AIR.
Slowly pull the balloon
away from your hair.
What do you notice?
strands of hair should stick
to the balloon.
electrons are transferred
from your hair to the balloon.
This is because the latex balloon
has a greater affinity for electrons
than your hair does.
to stick to the balloon?
opposite charges
attract each other . . .
NEGATIVELY charged.
POSITIVELY charged.
on your hair, negative electrical charges (electrons) from your hair are transferred to the balloon.
two NEGATIVELY charged balloons
next to each other?
Will they attract each other, too?
with smaller balloons.
(5 inch or 12 cm)
blow up
and knot two
fresh balloons.
Make sure
that they are
fully expanded
with air.
(30 cm) of thread
to each balloon.
balloons
vigorously
on your hair.
downward. To confirm this, try the very same experiment with smaller, thinner, lighter balloons.
Is the REPULSION more pronounced now? WHY? It takes less force to push the lighter balloons apart.
slowly move it toward the other balloon.
What happens?
Does one balloon avoid the other?
between the two balloons
are transferred from your hair to the balloons.
Both balloons become NEGATIVELY charged.
Objects with the same charge repel each other.
(free of lotion)
or paper towel
through the
inner loop
of the paperclip.
Tie a piece
of thread to
the paperclip.
first straw
by the string.
bring the charged straw
near one end of the
dangling straw?
straws with
the tissue
or paper towel.
for
answer.
two types of charge: PLUS and MINUS.
AND you learned these RULES for charges:
with protons
attract negative charges
and repel other
positive charges.
attract positive charges
and repel other
negative charges.
negative charges
interact with
OTHER positive
and negative charges
positive charges
interact with
OTHER positive
and negative charges
for
answer.
for
answer.
click on the red button.
4. Unlike charges attract.
5. Like charges repel.
charges are there
attract each other
a googol of positive charges
and a googol of minus charges,
WHAT is the total charge
It is NEUTRAL.
