Model Nature Observation Events Eksperimen Measurement Physical quantities What is measured?
meansurement Quality (Measurement Result tolls presentation prece unit Standard size System unit calibration System 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)
Definisi standar besaran pokok Length - meter: One meter is the path length in a vacuum through which the light within an interval of 1 / 299, 792.458 seconds. Mass - kilogram: One kilogram is the mass of platinum-iridium cylinder with a height of 39 mm and 39 mm diameter. Time - second One second is 9,192,631,770 times the period (vibration) radiation emitted by cesium-133 atom in a transition between two energy levels (hyperfine levels) contained in the basic level (ground state).
Derived Quantities Example: Speed performed per unit time shift unit: meters per second (ms-1) Acceleration change of velocity per unit time unit: meters per second squared (ms-2) Style mass times acceleration unit: 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 Simbol Dimensi Massa M Panjang L Waktu T Arus listrik I Besaran Pokok Simbol Dimensi Suhu Jumlah ZatN Intensitas J
Dimensional Analysis n A scale can be added or subtracted if it has the same dimensions. n Every tribe in the equations of physics must have the same dimensions
example : Simple swing period T expressed by the formula following: 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! question : dimension period [T] : T Dimension lenghy [l] : L Dimensions of the acceleration of gravity [g] : LT -2 : dimensionless
Model Peristiwa Alam Eksperimen Pengamatan Pengukuran Besaran Fisika Kuantitas Karakteristik Interaksi antar materi yang teramati Teori Konsep Fisika Hukum Fisika Apakah yang diamati ? Apakah yang diukur ?