Name: __________________
Date: ________________
PRACTICE 3 METHODS OF CHARGING OBJECTS
1.Charging by _______________
2. 2. Charging by _______________
3. Charging by _______________
an object is rubbed with another object
an object is touched with a charged object
an object is charged by bringing another charged
object near without touching
1. CHARGING BY _____________:
An electrostatic series lists materials in order of their
tendency to _____________ eHow to use the electrostatic series:
Material’s
hold on e-
Location on the
electrostatic
series (top or
bottom?)
Their
tendency of
gaining or
losing e-?
Resultant
charged
(+ or -?)
Weak
Strong
Practice:
Use the electrostatic series and arrow to label the flow
of electrons when the following uncharged objects are
rubbed against one another:
Example:
a. Aluminum
and
Paper
b. Plastic comb
and
wax
c. Styrofoam
and
Scotch Tape
d. Petri dish
and
silk
e. Ebonite
and
cat fur
f. Rubber balloon
and
leather
g. Saran wrap
and
Silver
h. wool
and
dry wood
i. acetate
and
glass
2. CHARGING BY CONTACT (I.E. CONDUCTION)
Two scenarios
Before touching
Upon touching
After touching
When a
negativelycharged
touches a
neutral object
Both objects are
_________
_____________ after
touching
When a
positivelycharged
touches a
neutral object
Both objects are
_________
_____________ after
touching

Conclusion:
The neutral object always ends up having the _______ type of charge as the charging object
3. CHARGING BY INDUCTION
Describing what happens here as a
negatively charge balloon is brought near
but not touching the neutral pop can:
How to permanent charge a neutral object by induction?
In 4 steps:
Step 1: Bring the charged object
near, but not _______________ the
neutral object
Step 2: Ground the neutral object
Step 3: Remove the ground
connection
Step 4: Withdraw the charging
object

To charge an object permanently by induction, it needs to be
_______________.

Grounding is a process of _______________ charges from an object
by contact with large, neutral object (such as the Earth)
Notice:
The initially neutral sphere now carries ________________________________________to that of the
charging object
Try it on your own:
Now you can draw diagram show how to permanently charge an object by induction with a positively-charged
rod. Ms. Pham’s initial HERE ________________
Conclusion:
The general rule is that the initially neutral sphere now carries
________________________________________________to that of the charging object when charged
by induction
APPLICATIONS OF STATIC ELECTRICITY
1. LIGHTNING:
Method of charging: _______________
- swirling winds in a storm cloud cause water and ice
particles to become charged
- Positive charges move to the top of the cloud
- Negative charges move to the bottom of the cloud
- The ground below is induced by the cloud to develop a
positive charge.
- When the difference in charge between the cloud and
Earth becomes great enough, a path forms and a surge of
electrons travel along this path producing a giant flash
called lightning.
Lightning rod:
- a pointed metal rod attached to the roof of a building. See
picture beside.
- is used to carry the harmful electrical current away from
buildings and safely to the ground when lightning strikes.
- A person is likely to be struck by lightning in an open field, under a tree
Safe places to hide from lightning:
House
Car (rubber tires)
Unsafe places to hide from lightning:
Open field
Under a tree
On a boat
Videos: Airplane struck by lightning: https://www.youtube.com/watch?v=hZCzintiS4c
Safety first at gas station: https://www.youtube.com/watch?v=tuZxFL9cGkI
2. Static-cling decals:
https://www.youtube.com/watch?v=hKP3pwNLcb8
3. Static spray: https://www.youtube.com/watch?v=nQWYP9ucyqk
4. Photocopier
https://www.youtube.com/watch?v=MJ5ghlTdF9k
5. Anti-static sheets
Clothes are made of different materials like cotton,
wool and nylon. When the clothes are put in a dryer,
the materials tumble around and rub against each
other. When the clothes are removed, they often stick
to each other. This is known as static cling.
To prevent static cling, an anti-static sheet (e.g.
Bounce or Downy) is placed in the dryer with the
clothes. The sheet contains a waxy compound that
vaporizes when the dryers heats up with hot air. The
waxy compound then coats all the clothing.
1. Explain why static cling happens by referring to the electrostatic series and electrons.
2. Explain how the anti-static sheet is able to prevent static cling. How does the waxy coating
affect the materials on the electrostatic series?
More Practice Charging by Contact: