..... “Wahai Tuhanku, ilhamkan daku supaya tetap mensyukuri akan nikmatMu yang engkau kurniakannya kepadaku dan kepada dua ibubapaku, dan supaya aku tetap mengerjakan amal soleh yang Engkau redhai; dan jadikanlah sifat-sifat kebaikan meresap masuk kedalam jiwa zuriat keturunanku. Sesungguhnya aku bertaubat kepadaMu, dan sesungguhny...a aku dari orang-orang Islam (yang tunduk patuh kepadaMu)” (Al-Ahqaf 46:15)

Monday, May 24, 2010

PHYSICAL QUANTITIES AND UNITS


PHYSICAL QUANTITIES
  1.   Physical quantities are quantities that can be measured.
  2.   Examples : length, mass, time, weight, electric current, force, velocity and energy.
  3.   To describe a physical quantity, two things must be specified: a numerical value and the unit. 

SI UNITS
  1. The unit of a physical quantity is the standard used to compare different magnitudes of the same physical quantity.
  2. In SI, each physical quantity has only one unit. Prefixes are attached to SI units.  
 
Prefixes
Factor
Symbol
Pico
10-12
p
Nano
10-9
n
Micro
10-6
m 
Milli
10-3
m
Centi
10-2
c
Deci
10-1
d
Kilo
103
k
Mega
106
M
Giga
109
G
Tera
1012
T


BASE QUANTITY AND BASE UNITS
QUANTITY
SI UNIT
SYMBOL
Length
Metre
m
Mass
Kilogram
kg
Time
Second
s
Electric current
Ampere
A
Thermodynamic temperature
Kelvin
K
Amount of substance
Mole
mol
Light intensity
Candela
cd
 
DERIVED QUANTITY AND DERIVED UNITS


  1.   A derived quantity is a combination of different base quantities.
  2.   The unit for a derived quantity is known as derived unit.



Derived quantity
Derived unit
Area
m2
Volume
m3
Frequency
Hz @ s-1
Density
kg m-3
Velocity
m s-1
Acceleration
m s-2
Force
N  @ kg m s-2
Pressure
Pa  @ N m-2
Energy or work
J  @ N m
Power
W  @ J s-1
Electric charge
C  @ A s
Electric potential
V  @ J C-1
Electric intensity
V m-1
Electric resistance
Ω  @ V A-1 
Capacitance
F  @ C V-1
Heat capacity
J K-1
Specific heat capacity
J kg-1 K-1
 
DIMENSIONS OF PHYSICAL QUANTITIES



  1. The dimension of a physical quantity is the relation between the physical quantities and the base physical quantities.
  2. The dimension of a physical quantity is represented by [ physical quantity ]



QUANTITY
SI UNIT
Dimension
Length
m
L
Mass
kg
M
Time
s
T
Electric current
A
A
Thermodynamic temperature
K
θ
Amount of substance
mol
N
Light intensity
cd
I
Derived quantity
Derived unit
Dimension
Area
m2
L2
Volume
m3
L3
Frequency
Hz @ s-1
T-1
Density
kg m-3
ML-3
Velocity
m s-1
LT-1
Acceleration
m s-2
LT-2
Force
N  @ kg m s-2
MLT-2
Pressure
Pa  @ N m-2
ML-1T-2
Energy or work
J  @ N m
ML2T-2
Power
W  @ J s-1
ML2T-3
Electric charge
C  @ A s
AT
Electric potential
V  @ J C-1
ML2TA-1
Electric intensity
V m-1
MLTA-1
Electric resistance
Ω  @ V A-1 
ML2TA-2
Capacitance
F  @ C V-1
A2M-1L-2
Heat capacity
J K-1
ML2T-2K-1
Specific heat capacity
J kg-1 K-1
L2T-2K-1



2 comments:

  1. arrrghhh
    srupo nok amik prekso A'level balik

    TIDAAAAAAAAAAAAK

    ReplyDelete
  2. muahaha... teringat zaman kegemilangan dio lah tuuuu...:)

    ReplyDelete

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