Physics Flashcards
Is a body of knowledge
that provide organized
answer to our questions
about the physical
world.
Physics
deals with macroscopic
objects moving at very
small speed compared
to the speed of light in
vacuum.
• Mechanics deals with motion, force, work,
energy and fluids.
• Heat & Thermodynamics deals with the effects
of heat when added to or removed from a
system, the methods of heat transfer, and the
transformation of heat to mechanical energy or
work and vice versa
• Optics deals with the study of light and its
properties
• Electricity & magnetism deals with the
phenomena associated with electrical charges
(whether at rest or moving), magnetism and the
relationship between electricity and magnetism
• Wave Motion & Sound deals with properties,
transmission and perception of different types
off waves.
CLASSICAL PHYSICS
• _____________ are a characteristic or
property of an object that can be measured
or calculated from other measurement.
• The seven fundamental quantities in physics
according to SI are length, mass, time,
temperature, electric current, luminous &
intensity
PHYSICAL QUANTITIES
• It is a process of comparing quantity with
another quantity
• ___________ involves comparison with a
standard.
• ___________ are never exact. All
measurement have uncertainties because of
errors.
Measurements
has the same unit as the
quantity itself. It show how large the error is
Absolute uncertainty
______________ is dimensionless and is
obtained by dividing the absolute uncertainty by
the numerical or measured value. The quotient is
usually expressed as percentage by multiplying it
by 100. It shows how large the error is in relation
to the true value.
Relative Uncertainty
________ is defined as how close a measured
value to a true or accepted value. The measured
error is the amount of inaccuracy
Accuracy
_________ is defined as how good a
measurement can be determined. When
measurements are done, precision is the amount
of consistency of independent measurements
and the reliability or reproducibility of the
measurements
Precision
Is multiple measurements of the same
quantity using the same instrument often
differ by more than the precision of the
instrument. It caused by fluctuations on the
physical properties being measured. i.e.
changes in temp., gas pressure, electricity
voltage, etc.
RANDOM OR STATISTICAL ERRORS
When dealing with measured
numbers, it is useful to consider the
number of significant figures. The
significant figures in any measurement
are the digits that are known with
certainty, plus one digit that is
uncertain.
SIGNIFICANT FIGURES
When adding or subtracting
measured quantities, the precision of
the answer only be as great as the
least precise term in the sum or
difference. All digits up to this limit of
precision are significant.
When multiplying or dividing
measured quantities, number of
significant digits in the result can only
be as great as the least number of
_____________ in any factor in the
calculation.
SIGNIFICANT DIGITS
A number in scientific notation is
expressed in the form of A x 10ⁿ
• Where A and n is an integer.
• A is a non-zero digit from 1-9
• n is the exponent. It may be positive or
negative depending if it is moved to
the right or to the left
SCIENTIFIC NOTATION
Those that can be described completely by their magnitudes and appropriate units
Have magnitude but no direction
Scalar quantities
Those that are completely described by magnitude appropriate units and directions
Have magnitude and direction
Vector quantities
A vector quantity could be represented by an arrow. The length and direction of the arrow represent the magnitude and direction of vector quantity
Vector representation
