SCIENCE 9 – ELECTRIC FORCE WORKSHEET
NAME:
Vocabulary
Attract
Electric force
Induction
Conduction
Electroscope
Neutral
Decrease
Increase
Repel
Use the terms in the vocabulary box to fill in the blanks. You will not need to use every term. You
can use the terms more than once.
1) A(n)
is a push or pull between charged objects.
2) The laws of static charge state that like charges
. Charged objects are attracted to
and opposite charges
objects.
3) If you increase the amount of charge on objects, you
the electric
force. If you
the distance between objects, you increase the
electric force.
4) If the leaves of an electroscope become charged, they will
each other.
5) Charging by
transferred from one object to the other.
occurs when objects touch and an electric charge is
6) Charging by
occurs when objects are charged without touching.
7) Neutral objects are attracted to charged objects because they are charged by
8) A negatively charged ruler is brought near a suspended ball. The ball is repelled by the ruler. What
can you conclude form this observation?
9) Two suspended balloons attract each other when brought close together. What can you conclude
about the balloons?
10) Explain why a positively charged object is attracted to a neutral object.
will move away from
used more than once.
will
not
B. The
ball
p
(a) You notice the build-up
of dust
on aiscom
eachsusp
othe
7. Two
each other
B.
C. The
ball
is n
(b)spheres
You
walk
across
andsuspende
experience
Diagram
Descriptor
bro
B.
suspended
11) For
each situation illustrated below, will the
objects
shown attract
or repel
each
other?a carpet when
doorknob.
will
move
D.
The
ball
is e
conclude
3.
will
move
toward
2.
(c) You rub a balloon against
your hair and b
1.
(a)
(b)
Comprehension
each
othe
Name
Date spheres
2.
A. suspended
to “jump
up
charged.
each other This causes the salt crystals
Section
7.2
will move away from
A. suspende
They h
C.
2. Identify
whether the illustration shows charg
C.each
suspended
spheres
7. Two suspended
other
will not m
Use with textbook pages 258–262.
(a)
B.
They bc
will
not
move
when brought
B. suspended spheres
Charging by conduction
or induction
conclude
about
will move
toward
C.
One
ba
2. ________________________________
________________________________
each
other
3.describe
Analyze the situations below. Do they
charging by conduction
or balloon
A. They
have o
3.
4.
(c)
(d)
C.
suspended
spheres
induction?
B. They
both ba
ha
will not move
D. One
1. Identify whether the situation is describing charging by conduction or induction.
balloon
balloon
balloon
Date is po
One
(a) You notice the build-up of dust on a computer screen when it C.
is on.
3.
4.
Name
8. aHow
(b) You walk across a carpet and experience
a(b)
shock when you touch
metal does
4.
D. One
balloon
________________________________
________________________________
doorknob.
amount
o
Use with textbook pages 258–262.
balloon
ne
(c) You rub a balloon against your hair and bring it close to a pile of salt
on theis
table
12) Analyze the situations below. Do they describe charging by conduction or induction?
This causes the salt crystals to “jump
up and dance.”
Charging
by conductionA.or
It indu
incre
Circle the letter of the best an
8. How does the e
(a) You notice the build-up of dust on a
(b) You walk across a carpet and experience a
Analyze
thebysituations
below. Do
they describe char
2. Identify
whether
the
illustration
shows
charging
conduction
induction.
shock when
you
touch a metalordoorknob.
amount
of char
4. computer screen when it is on.
B. It decre
5. Which
induction? of the following applies
(a)________________________________
________________________________
object?
1. Identify
whether the situationA.
is describing
It C.
increases.
It charging
stays
(c)
(c) You rub a balloon against your hair and
(d)
(a) You
notice
the build-up
dust best
on a computer
Circle
the
letter
of ofthe
answ
bring it close to a pile of salt on the table.
B.
It
decreases.
Circle
the theletter
ofto “jump
theupbest
answer.
D. It incre
This causes
salt crystals
and
I.
It is attracted to a positive
sur
(b) You walk across a carpet and experience a sho
5. Which
of the following
applies
C. It stays
the to
s
doorknob.
5. Which of the following applies
to aItneutral
9.a hair
Which
ofit
object?
II.
is
attracted
negative
(c) You rub
a balloon
againstto
your
and bringsu
Circle
the letter of the best answer.
D. toIt“jump
increases
This causes the salt crystals
up and
object?
about
theda
ItIt has
the
same
number
of by
pr
2.III.
Identify
whether
the
illustration
charging
electric
fo
I. a neutral
is attracted
ashows
positive
surfac
5. Which of the following applies
to
9.toWhich
of the
I.object?It is attracted to a positive surface.
electrons. about the relatio
(a)
________________________________
________________________________
II.
It is attracted to a negative
surfa
A. If
the
d
(e)
(f)
electric
force?
(b)II.
ItItisis attracted
to a negative surface.
I.
attracted to a positive surface.
III.
It has the same numberdecreas
of proto
dance”.
© 2007 McGraw-Hill Ryerson Limited
III.II.
III.
A.protons
I and asII only
ItIthas
the
same
number
of
is attracted to a negative surface. electrons.
electrons.
B. I and III only
It has the same number of protons as
A. I and
electrons.
A. I and II only
andIII
II only
B.A.I Iand
only
________________________________
(c)
and III only
C.B.III and
III only
A. If the distanc
B. If thethd
decreases,
decreas
B. If the distanc
II only
same.th
decreases,
C. II and III only
same.
B.
I and III only
C. If the d
________________________________
(b)
D. I, II, and III
distanc
C. II and III only C. If theincreas
increases, the
D. If the d
D. I, II, and III