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Physics a level equations and definitions
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Gravity
Terms in this set (88)
Electric current definintion
The rate of flow of charge
Potential difference definition
Work done per unit charge
Equation for current
I = Q/t
Equation for voltage
V = W/Q
Resistance equation
R = V/I
Equation for resistivity
Resistivity = RA/L
Energy equation
E = IVt
Power equation (simple)
P = IV
Power equation (I and R)
P = I^2R
Power equation (V and R)
P = V^2/R
Equation for emf (using energy)
EMF = E/Q
Equation for EMF (internal resistance)
EMF = I(R+r)
EMF definition
The electrical energy produced per unit charge passing through the source
Electrical power definition
The rate of energy transferred (or the energy transferred per unit of charge)
Equation for moments
M = Fd
Equation for weight
W = mg
Equation for speed
V = ∆s / ∆t
Equation for acceleration
a = ∆v / ∆t
SUVAT equation without s
V = u + at
SUVAT equation without u
S = vt - 1/2 at^2
SUVAT equation without v
S = ut + 1/2 at^2
SUVAT equation without a
S = (u+v) / 2 *t
SUVAT equation without t
v^2 = u^2 + 2as
Newton's second law equation
F = ma
Resultant force on car when car towing trailer
F = m(car)a = thrust force - tension
Resultant force on trailer when car towing trailer
F=m(trailer)a = tension
Combined equation for towing a trailer
F(thrust) = (m(car) + m(trailer))a
Resultant force of rocket
F=ma
Thrust force of rocket
Thrust = ma + mg
Equation for pulley system
m1g - m2g = (m1+m2)a
Resultant force sliding down a slope
mg sin(theta) - Fr = ma
Equation for momentum
p = mv
Equation for impact time
t = 2s / (u+v)
Equation for acceleration
a = (v-u) / t
Equation for force (momentum) (words)
Force = change in momentum / time taken
Equation for work done
W = fd
Equation for efficiency
Efficiency = useful energy output / total energy input
Equation for density
p = m / v
Equation for Hooke's law
F = kx
Equation for elastic potential of a spring (2)
Ep = 1/2 F ∆L = 1/2 k ∆ L^2
Equation for springs in series
1/ktotal = 1/k1 + 1/k2 + 1/k3 +...
Equation for springs in parallel
ktotal = k1 +k2 + k3 +...
Equation for stress
Stress = F / a
Equation for strain
Strain = ∆l / l
Equation for Young's Modulus (2)
Young's modulus = stress / strain = Fl / A∆L
Equation for impulse
F ∆t = m ∆v
Centre of mass definition
...
Proton
Baryon, 0, +1, +1
Neutron
Baryon, 0, +1, 0
Mesons
Hadron, 0, 0, 0
Electron neutrino
Leptons, +1, 0, 0
Muon neutrino
Lepton, +1, 0, 0
Muon
Lepton, +1, 0, -1
Electron
Lepton, +1, 0, -1
W/Z boson
Forces, 0, 0, + or -
Format
Category, lepton number, baryon number, charge (relative)
Name all of the base units
Kilogram, metre, seconds, ampere, kelvin, mole, candela
Base equivalent of force
kgms-2
Base equivalent of pressure
kgm-1s-2
Base equivalent of energy/ work
kgm2s-2
Base equivalent of frequency
s-1
Base equivalent of charge
As
Base equivalent of voltage
kgm2A-1s-3
Base equivalent of resistance
kgm2A-2s-3
Base equivalent of power
kgm2s-3
Tera
T 10^12
Giga
G 10^9
Mega
M 10^6
kilo
k 10^3
centi
c 10^-2
milli
m 10^-3
micro
10^-6
nano
n 10^-9
pico
p 10^-12
Phase difference
The amount that one wave lags behind another
Equation for wave speed
v = f x lambda
Equation for frequency
f = 1/T
Transverse waves
The direction of vibration is perpendicular to the direction
Longitudinal waves
The direction of vibration is parallel to the direction
Path difference
The difference between the distances travelled by two waves meeting at a point
Coherent wave definition
Waves with a constant phase difference and the same frequency
Equation for Young's double slit
w = wavelength * D / s
Equation for diffraction grating
dsin(theta) = n * wavelength
Equation for refractive index (speed of light)
ns = c/cs
Refractive index equation (sells law, multiplying)
n1 sini = n2 sinr
Modal (multipath) dispersion
When some light rays take a longer path than others, causing the pulse to broaden
Material dispersion
When there are different wave lengths present that travel at different speeds, casing the pulse to broaden
Equation for specific charge
Specific charge = charge / rest mass
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