PHYSICS AND SYSTEM UNITS AMOUNT

Model

Nature Observation Events

Eksperimen

Measurement Physical quantities What is measured?

meansurement

Quality

(Measurement Result

tolls

presentationprece unit

Standard size System unit

calibrationSystem Matrik SI

Magnitude

Physics

Conceptual

Matematis

Principal Amount

Derived Quantities

Scalar Quantities

Vector Magnitude

: specified quantities

  with a standard size

: Quantities of formulated

  magnitudes of principal

: only has value

: have the value and direction

Besaran Pokok(dalam SI)

Massa

Panjang

Waktu

Arus listrik

Suhu

Jumlah Zat

Intensitas

Satuan(dalam SI)

kilogram (kg)

meter (m)

sekon (s)

ampere (A)

kelvin (K)

mole (mol)

kandela (cd)

SISTEM MATRIK DALAM SI

Faktor Awalan Simbol

1018 exa- E

1015 peta- P

1012 tera- T

109 giga- G

106 mega- M

103 kilo- k

102 hekto- h

101 deka- da

Faktor Awalan Simbol

10-1 desi- d

10-2 senti- c

10-3 mili- m

10-6 mikro-

10-9 nano- n

10-12 piko- p

10-15 femto- f

10-18 ato- a

Definisi standar besaran pokok

Length - meter:Length - meter:One meter is the path length in a vacuum through which the light One meter is the path length in a vacuum through which the light within an interval of 1 / 299, 792.458 seconds.within an interval of 1 / 299, 792.458 seconds.Mass - kilogram:Mass - kilogram:One kilogram is the mass of platinum-iridium cylinder with a One kilogram is the mass of platinum-iridium cylinder with a height of 39 mm and 39 mm diameter.height of 39 mm and 39 mm diameter.

Time - secondTime - secondOne second is 9,192,631,770 times the period (vibration) radiation One second is 9,192,631,770 times the period (vibration) radiation emitted by cesium-133 atom in a transition between two energy emitted by cesium-133 atom in a transition between two energy levels (hyperfine levels) contained in the basic level (ground state).levels (hyperfine levels) contained in the basic level (ground state).

Derived Quantities Example:

  Speedperformed per unit time shiftunit: meters per second (ms-1)  Accelerationchange of velocity per unit timeunit: meters per second squared (ms-2) Stylemass times accelerationunit: newtons (N) = kg m s-2

Dimension Dimensions expressed the essence of a physical quantity does not

depend on the units used.The distance between two places can be expressed in meters, miles, steps, etc.. Whatever the distance unit is basically a "long".

Besaran Pokok

SimbolDimensi

Massa M

Panjang L

Waktu T

Arus listrik I

Besaran Pokok

SimbolDimensi

Suhu

Jumlah Zat N

Intensitas J

Dimensional Analysis

A scale can be added or subtracted if it has the A scale can be added or subtracted if it has the same dimensions.same dimensions.

Every tribe in the equations of physics must have Every tribe in the equations of physics must have the same dimensionsthe same dimensions

example :Simple swing period T expressed by the formulafollowing:

where l is the length of string and g acceleration of gravity with the square length unit per time. Show that the equation is dimensionally correct!

T lg2

question :

dimension period [T] : T

Dimension lenghy [l] : LDimensions of the acceleration of gravity [g] :LT-2

: dimensionless

2LTL

T

T

Model

Peristiwa Alam

Eksperimen

Pengamatan

Pengukuran

Besaran Fisika

Kuantitas

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