User:FreeT/Physics Equations
Please do not edit this page. This is part of FreeT's space to type thoughts to use for a later time, giving a higher quality to the finished article.
This subpage is about physics equations on the Irish Leaving Certificate sylabus. You may of course copy material from here, just please don't edit it. If you can come up with some good mnemonics, please enter them.
*Edit*
From the 2010 Leaving Certificate on, new log tables will be supplied for the exams which will include most of the following formulae. Still, I'll finish the list for anyone who would like to learn them, or needs to learn them for a different exam.
Reflection of Light from Spherical Mirrors
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/65/Mirror.globe.arp.500pix.jpg/200px-Mirror.globe.arp.500pix.jpg)
Formula | Abbreviations | Mnemonic |
---|---|---|
u - distance from the object to the mirror
v - distance from the image to the mirror |
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m - magnification u - distance from the object to the mirror |
over under |
Refraction
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/48/%28175%29_Refraction.jpg/250px-%28175%29_Refraction.jpg)
Formula | Abbreviations | Mnemonic |
---|---|---|
i - Angle of incidence r - Angle of refraction |
Being rare gets presidence over being dense | |
For any two media x and y n - Refractive index between the two media |
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n - Refractive Index of medium | Real truth presides over apparent truth anyday | |
n - Refractive Index of medium | The vacuum is always lighter, so it rises to the top | |
n - Refractive Index C - Critical angle |
Lenses
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/82/Large_convex_lens.jpg/250px-Large_convex_lens.jpg)
Formula | Abbreviations | Mnemonic |
---|---|---|
u - distance from object to lens v - distance from image to lens |
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m - magnification v - distance from image to lens |
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P - power of lens f - focal length |
power of lens is measured in per metres | |
P - overall power of combination of lenses P1 - power of first lens |
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f - overall focal length of combination of lenses f1 - focal length of first lens |
Temperature
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Pakkanen.jpg/220px-Pakkanen.jpg)
Formula | Abbreviations | Mnemonic |
---|---|---|
t(C) = t(K) - 273.15 | t(C) - temperature in degrees Celsius t(K) - temperature in degrees Kelvin |
To serve three-period, single fights. Small number = Big number - a lot. |
Quantity of Heat and Heat Transfer
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
Q - heat energy m - mass (kg) |
MCAT | |
Q - heat energy m - mass (kg) |
Waves and Wave Motion
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/43/2006-01-14_Surface_waves.jpg/300px-2006-01-14_Surface_waves.jpg)
Formula | Abbreviations | Mnemonic |
---|---|---|
T - time for one cycle to pass a point f - frequency (hz) or cycle per second |
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c - velocity of wave f - frequency |
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f' - observed frequency f - actual frequency |
Vibrations and Sound
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
I - sound intensity P - power |
Patrick's over-Aim is an Intense miss | |
f - fundamental frequency l - length |
2 Live freely is the root of tears undue. | |
overtone = harmonic | n - any number | |
c = 4f (l + 0.3 d) | c - speed of sound in medium f - frequency of note emitted |
Static Electricity
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
Q1 and Q2 = charges F = force between charges |
Queens over four pies eating a square dinner = very forceful. | |
E = Permittivity of medium Er = Relative permittivity of medium |
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E = Electric Field Strength F = Force |
'Free and easy but queasy' triangle |
Potential Difference and Capacitance
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
W = QV | W = Work Done Q = Charge/Number of Coulombs Transferred |
Where is the Queen's Vulture? |
C = Capacitance of a conductor Q = Charge |
'Queens Catch Vultures' Triangle | |
C = Capacitance of a conductor d = Distance between plates |
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W = Energy stored in a charged capacitor C = Capacitance of a conductor |
Similar to in log tables. |
Current and Charge
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
Q = It | Q = Charge gone past I = Steady current |
Similar to "quit". |
Electromotive Force and Potential Difference
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
W = QV | W = Energy given out Q = Charge gone past |
Where is the Queen's Vulture? |
VI=P | V = Potential difference between two points I = Current flowing between two points |
Very Important Person |
Resistance, Current, Voltage
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
R = Resistance V = Potential / Voltage |
Ronaldo is Very over Inphasised. | |
p = Resistivity of the material in the conductor R = Resistance |
Pink Light is Readily Accepted | |
l = Length p = Resistivity of the material |
4 Pirate Leaders are Raiding Pies at the square Dance | |
When a wheatstone bridge is balanced:
|
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P = Power I = Current |
Twinkle, twinkle little star, Power = I squared R | |
Series Circuit
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
R = Total resistance R1, R2 and R3 are separate resistors in series |
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A1, A2 and A3 are three ammeters in series | ||
V = Total voltage V1, V2 and V3 are three batteries in series |
Parallel Circuit
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
R = Total resistance R1, R2 and R3 are separate resistors in parallel |
||
A1, A2 and A3 are three ammeters in parallel | ||
V1, V2 and V3 are three batteries in parallel |
Effects of an Electric Current
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
W = Heat given out by a wire I = Current |
Speed, Displacement and Velocity
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
v = Average velocity s = Displacement |
Acceleration
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
a = Average accleration v = Final velocity |
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a = Average accleration v = Final velocity |
Given in log tables | |
a = Average accleration s = Displacement |
Given in log tables | |
v = Final velocity u = Initial velocity |
Given in log tables |
Force, Mass and Momentum
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
F = ma | F = Force m = Mass |
|
p = mv | p = Momentum m = Mass |
|
F = Force m = Mass |
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m1 = Mass of object 1 u1 = Initial speed of object 1 |
Pressure and Gravity
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
i.e. |
p = Density m = Mass |
"Monkeys Drink Vodka" Triangle |
P = Pressure F = Force |
Given in log tables | |
P = pgh | P = Pressure p = Density |
Given in log tables |
Magnetic Fields
[edit]Formula | Abbreviations | Mnemonic |
---|---|---|
F = Force B = Flux density of field |
Bills are forceful | |
F = Force on particle q = Charge on particle |
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= Magnetic Flux B = Magnetic Flux Density |
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Induced emf E = (Final flux - Initial flux) / (Time taken) |