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**pResentation about Physic Formula**

NITA ANDRIANA IX-Bhe

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cLass 7

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**Temperature Relationship between four scale is formulated as follow:**

C :R : F : K = 100 : 80 : 180 : 100 or C : R : F : K = 5 : 4 : : 5

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**Relationship between Celsius and Reamur**

tR = 4 tc or tc = 5 tR In which: tR = thermometer reamur tc = Thermometer celsius

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**Relationship between Celsius and Fahrenheit**

tF = 9 tc or tc = 5 . (tF – 32) In which: tF = thermometer Fahrenheit tc = Thermometer Celsius

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**Relationship between Celsius and Kelvin**

TK = TC or tc= TK – 273 In which: tk = thermometer Kelvin

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**Pemuaian Menghitung Muai panjang pada zat Padat Rumus-rumus:**

l = æ .lo . t lt = lo (1 + æ . t) in which: æ = koefisien muai panjang (L0C) lo = Panjang awaln (m) lt = panjang akhir (m) l= perubahan panjang (m) t = perubahan suhu (0C)

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**Muai Luas A = ß . AO . t At = Ao (1+ ß. t)**

In which: ß= koefisien muai luas (L0c) Ao= luas mula-mula (m2) At = luas akhir (m2) t = perubahan suhu

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**Muai volume ( Ruang) V = ý.Vo. t Vt = Vo (1 + ý . t)**

In which: ý= koefisien muai panjang (l0C) Vo= volume awal Vt= voluma akhir t= perubahan suhu

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**KALOR Q= m. c . t In which: m= massa benda (kg)**

c = kalor jenis (J/kg0c) Q = banyaknya kalor (J) t= perubahan suhu (0C)

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**Capacity of Kalor C = Q t Q = m. U In which: Q= kapasitas kalor (J)**

Q= kalor (J) t= perubahan suhu C= kapasitas kalor Q = m. U In which: Q= kapasitas kalor (J) m= massa (Kg) U=kalor uap/ kalor embun (J/kg)

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**Melebur dan membeku Q = m .L In which: Q= Banyaknya kalor (J)**

m= massa (Kg) L = kalor lebur (J/kg)

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**ASAS BLACK Qlepas = Qserap m1. c1. t1= m2.c2. t2 Ket: m= massa (kg)**

c = kalor jenis (J/kg0C) t= perubahan suhu (0c)

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The ForMula OF phiSyc clAss- 8

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Force and Newton's law Force is quantity that can cause something moves or on the contrary causes the moving thing to be a rest.

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**in which: w = weight/berat (N)**

weight (gaya berat) Weight = mass x gravitational acceleration (berat = masa x percepatan gravitasi) w = m.g in which: w = weight/berat (N) m = mass/masa (kg) g = Earth gravitational acceleration /percepatan gravitasi bumi (m/s2)

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**Newton's Law There are there opinion about Newton’s Law:**

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**Newton’s 1 Law Newton’s Law explains:**

“Every body will be at rest or moves in uniform rectilinear if there is no forces change that condition.” The formula of Newton’s 1 law as follow: €F= 0 Which means force resultant on the body is equal to zero

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Newton’s 2 Law The body that influence force will have acceleration which its magnitude is directly proportional to the magnitude of the sum of forces and inversely proportional to its mass. The formula of Newton’s 2 Law: a = F/m or F = m.a In which: F= the force acting on the body / gaya yang bekerja pada benda (N) m= mass of the body (kg) a=acceleration of the body/percepatan benda (m/s2)

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Newton’s 3 Law If a body makes force (making action) to another body, appears reaction force from the body to the former body with equal magnitudes, while the direction are in opposite. The formula of Newton’s 3 Law: FACTION= - FREACTION In which: F1 = Action force/gaya aksi F2 = reaction force/gaya reaksi The sign (-) shows those two forces are in opposite direction

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**PRESSURE The formula of pressure: P = F/A**

In which: P = Pressure / tekanan (N/m2) F= Force/ gaya (N) A= Plane area/ luas bidang (m2) The pressure unit= force unit/area unit= N/m2= Pascal (Pa) So, 1 Pa= 1 N/m2 In cgs system pressure pressure unit in is dyne/cm2. Another pressure units are as follows 1 atm = 76 cm Hg and 1 N/m2 = dyne/cm2

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**PRESSURE IN SOLID p= p.g.h**

Liquid pressure in motionless is called Hydrostatics pressure. Hydrostatics pressure depends on density, height or depth of liquid, also earth gravitational acceleration, so the formulated as follow: p= p.g.h In which: p= hydrostatics pressure (N/m3 or Pa) p= density of Liquid (kg/m3) g= Earth gravitational acceleration (m/s2) h= height or depth of the liquid (m)

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**Pascal’s Law Pascal expressed that:**

Pressure given to liquid in closed chamber will be continued by the liquid to every direction with uniform and the same magnitude. The formula of Pascal’s law as follow: P = F A In which: P= Pascal’s Law (N/m2) F= Force (N) A= Section area (m2)

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**Archimedes’s Law The formula of Archimedes's Law as follow: FA=p V g**

In which: FA= Buoyancy force (N) p = density of liquid (kg/m3) V = Volume of liquid moved (m3) g = Earth gravitational acceleration (m/s2)

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**Relationship between height of place and air pressure is formulated as follow:**

h= {76 – x} . 10 m 0,1 In which: h= height of place above sea level (m) x= pressure of place above sea level (cmHg)

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**In mercury manometer pressure in a chamber is formulated as follow:**

P= 76 cmHg + t In which: t= difference of mercury height in both manometer legs. The addition sign (+) is used if chamber pressure is larger than atmospheric pressure. On the contrary the minus sign (-) is used if chamber pressure is smaller than atmospheric pressure.

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**Boyle’s Law P x V = C Or can be written as follow: P1 x V1 = P2 x V2**

From that conclusion, that Boyle made a statement, that is: “At constant temperature, gas pressure in closed chamber is inversely proportional with its volume.” The statement above is known with Boyle’s Law: P x V = C In which: P= pressure V=volume C= constant Or can be written as follow: P1 x V1 = P2 x V2 In which: P1= Initial pressure V1= initial volume P2= final pressure V2=final volume

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**Energy Mechanical energy (energy mekanik) Consist of two part:**

Potential energy Kinetic energy

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**Formulated of potential energy and Kinetic energy**

EP= m.g.h In which: Ep= Potential energy (J) m= mass of the body (kg) g= Earth gravitational acceleration (m/s2) h= height of the body to Earth surface (m) Kinetic Energy Ek= ½. M.v2 In which: Ek= kinetic energy ( J) m= mass of the body ( kg) v= velocity of the body (m/s2)

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**Law of mechanical Energy Conservation**

Formula as follow: Em= EP + EK IN WHICH: Em= MECHANICAL ENERGY (J) Ep= potential energy (J) Ek= kinetic energy (J) Or EMA = EMB In which: EMA =mechanical energy at A EMB = Mechanical energy at B

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**The law of mechanical energy conservation**

Mechanical energy that a body has stored consist of potential energy and kinetic energy. Mechanical energy is formulated as follow. Em = Ep + Ek EmA = EmB EpA + EkA = EpB + EkB

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**Work Work is formulated as follow: W = F . S**

In which : W= work/usaha (joule) F = force/gaya (N) s = displacement/perpindahan (m)

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**The work done by force that works on a body is equal to the change of kinetic energy of the body.**

W = Ek2 – Ek1 W = ½ mv22 – ½ mv21

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Power Power is velocity to do work or work per unit time. Power is formulated as follow: P = W t Power unit according to SI is watt

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**kM = load/power = w/F = lk / lb**

Mechanical advantage kM = load/power = w/F = lk / lb In which: F= power lk = power arm w = load lb= load arm

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**Mechanical advantage of fixed pulley**

kM = 1 Mechanical advantage of moving pulley kM = w/F = w/w= 2 2 In pulley system the mechanical advantage obtained depends on the number of pulleys used. kM = n n = number of pulley

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**In the sloping plane holds the following equation.**

F . S = w . H The mechanical advantage of sloping plane kM = w/F

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**VIBRATION AND WAVE Relationship between period (T) and frequency (f)**

T= 1 or f = 1 f T

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**Relationship among length, period, frequency, and velocity of the wave.**

v = or v= . f T In which: v=velocity = leght T = period f = frequency

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**Sound V = s t Sound is a longitudinal wave.**

Sound velocity is the distance traveled by sound wave in every time unit. Sound velocity is formulated as follow: V = s t

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**Sound velocity can be determined by using sound reflection.**

V = 2 s t

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LIGHT Light is an electromagnetic wave that spreads without medium.

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**In the concave mirror and the convex mirror hold the formula:**

F S0 Si R S0 Si

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**Image magnification in the concave mirror and the convex mirror is formulated as follow:**

M = Si= hi S0 h0

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The ability of a lens in collecting or spreading it receives is called the power of lens. The power of lens is formulated as follow: P = 1/ f

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Optical instrument Image magnification in the magnifying glass is stated as follow: For the eyes doesn’t accommodate For the eyes that accommodates at the distance x For the eyes that accommodate maximum

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**For the eyes that accommodates at the distance x**

For the eyes doesn’t accommodate M = Sn f For the eyes that accommodates at the distance x M = Sn + Sn f x For the eyes that accommodate maximum M = Sn + 1

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cLass 9

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Electrostatics

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Coulomb’s Law The magnitude of the electric force between two charge is directly proportional to each charge and inversely proportional to the square of the distance between them. F= k . Q1 .Q2 r2 Note: F = Coulomb’s force (attractive or repulsive force) (N) Q1,Q2 = electric charge (C) R = the distance between the two charges (m2) K = fundamental electric constant = 9 x 109 (Nm2/C2)

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**Electric field is a vector quantity**

Electric field is a vector quantity. Electric field intensity is mathematically formulated as: E = F q Note: E = electric field intensity (N/C) F = Coulomb’s force (N) q = electric charge (C)

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**Electric potential Vab = W q Note:**

VAB= Electric potential between point A and B (Volt) W = The work required to move a charge (Joule) q = electric charge ( Coulomb)

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Electrodynamics

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**Electric Current I = Q t NOTE: Q= Electric charge (C)**

I = electric current (A ) t = time interval (s)

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**Ohm’s Law V = I . R Note: R= Electric resistance (Ohm)**

V= potential difference (volt) I= electric current ( Ampere)

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**Resistivity R = P. l A Note: R= Resistance of the wire (ohm)**

l = The length of the wire (m) A= The diameter of the wire p = resistively of the wire (ohm.m)

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Kirchhoff Current Law Kirchhoff current Law is the total electric current into the junction is equal to the total electric current. € IIN = € Iout

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Resistors in parallel The equivalent resistance of resistors in parallel: 1 = … Rp R1 R2 R3

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**Resistors in series The equivalent resistance of resistors in series:**

RSERIES = R1 + R2 + R3 + …

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NItA ANDRIANA 9-bHe By: fIniSH no.15

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