Iona Prep Physics Formulae

 

Mechanics

vaverage= Ds/Dt
vaverage = (vf + vi)/2
aaverage = (vf - vi)/t
s = vit + .5*a*t2
vf2 = vi2 + 2*a*s
F = ma
w = mg
F = (G m1m2)/r2
p = mv
J = FDt
FDt = mDv


Energy

W = FDs
P = W/Dt = FDs/Dt = Fvav
DPE = mgDh
KE = .5*m*v2
F = kx
PEs=.5*k*x2

Internal Energy

Q = mc D T
Qf= mHf
Qv= mHv

Symbols

a = acceleration
r = distance between centers
F = force
g = acceleration due to gravity
G = universal gravitation constant
J = impulse
m = mass
p = momentum
s = displacement
t = time
v = velocity
w = weight
h = height
k = spring constant
KE = kinetic energy
P = power
PE = potential energy
PEs = potential energy stored in spring
W = work
x = change in spring length from equilibrium position
c= specific heat
Hf= heat of fusion
Hv = heat of vaporization
Q = amount of heat
D T = change in temperature

Electricity and Magnetism

F=kq1q2/r2
E = F/q
V = W/q
E = V/d
I = Dq/Dt
R = V/I
P = VI = I2R = V2/R
W = Pt =VIt =I2Rt
F=qvB
V=Blv

Series Circuits:

It = I1=I2=I3=...
Vt=V1+V2+V3+...
Rt=R1+R2+R3+...

Parallel Circuits:

It=I1+I2+I3+...
Vt=V1=V2=V3=...
1/Rt= 1/R1+1/R2+1/R3 +...

Transformers

Np/Ns=Vp/Vs
VpIp=VsIs (ideal)
%Efficiency =
100*(VsIs)/(VpIp)

Symbols

B = flux density
F = force
Ip = current in primary coil
Is = current in secondary coil
Np= number of turns of primary coil
Ns= number of turns of secondary coil
q = charge
v = velocity
Vp = voltage of primary coil
Vs = voltage of secondary coil
l = length of conductor
V = electrical potential difference

Waves and Optics


T = 1/f
v = f l
n = c/v
sin qc = 1/n


n1 sin q1 = n2 sinq2
n1v1=n2v2


l /d = x/L


1/do+ 1/di = 1/f
So/Si = do/di

Symbols:


c=speed of light in a vacuum
d = distance between slits
f = frequency
L = distance from slit to screen
n = index of absolute refraction
T = period
v = speed
q = angle
qc = critical angle
x = distance from center to first maximum
l = wavelength of light
di= image distance
do= object distance
f = focal length
So = object size
Si = image size

Modern Physics


Wo = hfo
Ephoton = hf
KEmax = hf - Wo
p = h/l
Ephoton = Ei - Ef

Nuclear Energy


E = mc2
mf = mi/2n

Motion in a Plane


viy = visin q
vix = vicos q
ac = v2/r
Fc = mv2/r

Symbols:


c = speed of light in a vacuum
E = energy
f = frequency
fo = threshold frequency
h = Planck’s constant
KE = kinetic eenrgy
p = momentum
Wo = work function
l = wavelength
m = mass
n = number of half-lives
ac = centripetal acceleration
Fc = centripetal force
r = radius
v = velocity
q = angle


Last Update: by Br. Robert W. Harris

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