Galileo Galilei
pioneered the experimental scientific method
and was the first to use a refracting telescope
to make important astronomical discoveries.
He is often referred to as the “father of
modern astronomy” and the “father of
modern physics”. Albert Einstein called
Galileo the “father of modern science.”
ELECTRIC
CHARGE
General Physics 2 l Quarter 3 l Lecture 1
Lesson 1.1
STATIC ELECTRICITY
occurs when an object obtain a net amount
of positive and negative electric charges
Lightning Strike
STATIC
ELECTRICITY
Electrostatics is the interactions
between electric charges that are
at rest.
CHARGES
The two types of electric charge
were positive and negative by the
American statesman, philosopher,
and scientist Benjamin Franklin
(1706-1790)
Thus, a normal and
LAW OF CONSEVATION
OF CHARGES
Electrons are never created nor destroyed,
but are simply transferred from one material
to another.
Charging by Friction
When two different insulating materials
are rubbed, electrons get transferred
from one body to another.
Charging by Contact
The process of giving one object a
net electric charge by placing it in
contact with another object that is
already charged.
Charging by Polarization
Electric polarization refers to the separation
of center of positive charge and the center
of negative charge in a material.
Charging by
Induction
A charging method that
charges an object without
actually
touching
the
object
to
any
other
charged object.
GROUNDING
The process of removing the
excess charge on an object
by means of the transfer of
electrons between it and
another
object
of
substantial size. When a
charged object is grounded,
the
excess
charge
is
balanced by the transfer of
electrons
between
the
charged
object
and
a
ground.
ELECTRICAL FORCES
(Coulomb’s Law)
COULOMB’s LAW
The magnitude of the electric force between
two point charges is directly proportional to the
product of the charges and inversely
proportional to the square of the distance
between them.
Charles-Augustin de Coulomb
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