EM Flashcards
Unit 1 - 2 (Memorization of Conversions of Unit Included)
is a physical science which describes and
predicts the conditions of rest or motion of bodies
under the action of forces. Force, moment and motion
concepts.
Mechanics
may be defined as the growth of ideas through
observation and experimentation. In this sense,
the subject does not, necessarily, has to contribute
something to the welfare of the human life,
although the man has received many benefits
from the investigation.
SCIENCE
the world of science is so vast that the
present-day scientists and technologists have to
group the various spheres of scientific activities
according to some common characteristics to
facilitate their training and research programs.
APPLIED SCIENCE
is that branch of Applied Science, which deals with the laws
and principles of Mechanics, along with their applications to
engineering problems.
ENGINEERING MECHANICS
It is that branch of Engineering Mechanics,
which deals with the forces and their effects, while
acting upon the bodies at rest.
Statics
It is that branch of Engineering Mechanics,
which deals with the forces and their effects, while acting
upon the bodies in motion.
Dynamics
1 inch (in.) to cm
2.54 centimeters (cm.)
1 foot (ft.) to inches
12 inches (in.)
yard (yd.) to feet
3 feet (ft.)
1 mile (mi.) to feet
5280 feet (ft.)
1 nautical mile (nmi.) to meters
1852 meters (m.)
1 ton (t)
1000 kilograms (kg)
1 pound (lb)
16 ounces (oz.)
1 ounce (oz)
28.53 g
1 minute (min)
60 seconds (sec)
1 hour (hr)
60 minutes (min)
1 day
24 hours (hr)
1 week
7 days
1 year
12 months,365 days,366 days, if leap year
1 century
100 years
1 decade
10 years
SYSTEM OF UNITS
1 C.G.S. units
- F.P.S. units
- M.K.S. units
- S.I. units.
In this system of units, the fundamental units are meter (m), kilogram
(kg) and second (s) respectively.
S.I Units (International System of Units)
(or sometimes known as scalars) are
those quantities which have magnitude only such as length,
mass, time, distance, volume, density, temperature, speed etc.
SCALAR QUANTITIES
Calculate the total mass of a 85 kg climber carrying a 15 kg
backpack
Given : 75 kg climber
15 kg backpack
Required :
Total Mass?
Solution :
75 kg + 15 kg = 90 kg
(or sometimes known as vectors)
are those quantities which have both magnitude and
direction such as force, displacement, velocity, acceleration,
momentum etc.
The vector quantities
is a single force that has the same
effect as two or more forces acting together. You can easily
calculate the resultant force of two forces that act in a straight
line.
resultant force
Consider two vectors PQ and RS, which are required to be added, Forming a triangle. This method of adding the two vectors is called
called the Triangle Law of
Addition of Vectors
Two vectors can be added to give a resultant; this resultant
in turn can be added to a third vector etc., until all the vectors have
been added together to give an overall resultant.
Graphically
The vectors can be resolved into components that
coincide with arbitrarily chosen areas. The components of each vector
with respect in these axes can be added algebraically, and resulting
additions will be the components of the overall resultant vector.
Analytically
Factor and symbol of Yocto
10^-24 y
Factor and symbol of Zepto
10^-21 z
Factor and symbol of Atto
10^-18 a
Factor and symbol of Femto
10^-15 f
Factor and symbol of Pico
10^-12 p
Factor and symbol of Nano
10^-9 n
Factor and symbol of Micro
10^-6 μ
Factor and symbol of Milli
10^-3 m
Factor and symbol of Centi
10^-2 c
Factor and symbol of Deci
10^-1 d
Factor and symbol of Deka
10 da
Factor and symbol of Hecto
10^2 h
Factor and symbol of Kilo
10^3 k
Factor and symbol of Mega
10^6 M
Factor and symbol of Giga
10^9 G
Factor and symbol of Tera
10^12 T
Factor and symbol of Peta
10^15 P
Factor and symbol of Exa
10^18 E
Factor and symbol of Zeta
10^21 Z
Factor and symbol of Yota
10^24 Y
