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physics last test staticelectricity packet test
questions and answers
fossil fuel called amber would ______ small objects
after being rubbed with wool.
attract
when any two nonconducting substances are
rubbed together, what happens?
static charge
when any two nonconducting substances are
rubbed together, static electricity occurs. The
substance that picks up the electrons get a ____
charge
negative
when any two nonconducting substances are
rubbed together, static electricity occurs. The
substance that loses electrons gets a ______ charge
positive
On a dry day when you rub a balloon in your hair,
the balloon becomes negatively charged and will
conventionally stick to the neutrally charged wall.
What will happen to the walls charge?
it will become polarized. the balloon, with a
negative charge will attract the positive charges
from the neutral wall and repel the negative
charges that are within the wall. (-+ -)
,there are two kinds of charges. what are they?
positive and negative
excess electric charge on glass rod is called
positive
excess electric charge on the rubber rod is called
negative
like charges ____ one another
repel
unlike charges ______ one another
attract
protons have what charge
positive charges
where are protons and neutrons located?
in the nucleus
where are electrons found?
in the electron cloud around the nucleus
electrons have what kind of charge
negative charge
neutrons have what kind of charge
neutral charge
an electron and a proton has the same ________ of
charge but the opposite
magnitude; sign
,do protons move?
they never move from one material to another
electrons are far lighter than protons and are
_______ easily accelerated by forces
more
how do objects become charged?
gaining or losing electrons
charge transfers readily from one type of material
to another. Rubbing the two materials together
serves to _________ the area of contact, facilitating
the transfer process
increase
electric charges are always _______
conserved
Charge isnt created when two neutral objects are
rubbed together; rather, the objects become
charged because
negative charge is transferred from one object to
the other.
(one object gains a negative charge while the other
loses an equal amount of negative charge and
hence is left with a net positive charge.)
When a glass rod is rubbed with silk electrons are
transferred from the ______ to the _____; therefore,
the glass rod carried a net positive charge and the
silk a net negative charge
, rod; silk
when rubber is rubbed with fur, electrons are
transferred from the ____ to the _____
fur; rubber
in 1909 ______ _____ discovered that if an object is
charged, its charge is always a multiple of a
fundamental unit of charge, designated by the
symbol e. modernly, the charge is said to be
quantized (whole numbers).
robert milikan
that charge occurs in discrete chunks that cant be
further subdivided (only whole number values)
quantized
a neutral atom (an atom with no net charge)
contains as many protons as ________
electrons
this persons work on electricity in the late 1740s
changed a jumbled, unrelated set of observations
into a coherent science; he also named the two
kinds of electrical charge (positive and negative)
benjamin franklin
electric charges move freely in response to an
electric force.
conductors
all other materials that do not move freely in
response to an electric force is called what
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