A2 Physics Formulas
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or to the real
meaty A2 revision
Exponential decay
In
capacitors
Charge at time t is equal to charge at time t = 0 times e to the power –t / RC,
where R means resistance in Ohms and C means capacitance in Farads
Q = charge
V = potential difference
I = current
e ≈ 2.718
t = time
R = resistance in Ohms,
Ω
C = capacitance in Farads, F
Xt = value of X at
time t
X0 = initial value
of X
In
optical fibres
I0 = original
light intensity
Ix = intensity at distance x along fibre
μ = absorption
coefficient of optical fibre in per metres, m-1
x = distance
along fibre from original light source
Nuclear Physics
Can be rewritten as…
…which means the change in
energy is equal to the change in mass times the speed of light squared
Circular Motion
Velocity in a straight line
is equal to angular velocity times radius
Time period is equal to circumference
(in radians) divided by angular velocity
Acceleration is equal to
linear velocity squared divided by radius
Acceleration is equal to
radius times angular velocity squared