Cheatography
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0625 IGCSE physics formulas updates every 2 weeks with a new chapter
This is a draft cheat sheet. It is a work in progress and is not finished yet.
Energy
kE = 1/2mv2 |
F = ∆p/∆t |
∆GPE = mg∆h |
W = Fd = ∆E |
W = Fd |
(%) efficiency = (useful energy output) (total energy input) × 100% |
(%) efficiency = (useful power output) (total power input) × 100% |
P = W / t |
P = ∆E/ t |
p = F / A |
∆p = ρg∆h |
T (in K) = θ (in °C) + 273 |
pV = constant |
c = ∆E / m∆θ |
Forces
∆p = ρg∆h (liquid pressure) |
Pressure = force / area |
W = m x g |
kE = 1/2mv2 |
a = v-u / t |
R.F = F.F - B.F |
R.F or F = m x a |
R.F or F = m x a = m x (v-u/t) = mv - mu /t = change in momentum/t |
F = ∆ momentum or P/∆t |
impulse = R.F or F x ∆t |
impulse = change in momentum/ change in time |
m1u1+ m2u2 = m1v1+ m2v2 (conservation of momentum) |
m1u1 + m2u2 = (m1+m2) x V (when objects stick together) |
Thermal physics
kE = 1/2mv2 |
F = ∆p/∆t |
p is inversely proportional to V |
W = Fd = ∆E |
p1v1 = p2v2 |
c = ∆ E m∆θ |
specific heat capacity = change in thermal energy/mass x change in temperature |
P = ∆E/ t |
p = F / A |
∆p = ρg∆h |
T (in K) = θ (in °C) + 273 |
pV = constant |
c = ∆E / m∆θ |
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waves
where n is the refractive index, V is speed of light |
n = sin(i)/sin(r) |
n = 1/ sin(c) |
n2/n1 = V1/V2 = sin(i)/sin(r) |
n ( in air ) = 1 |
V (in air) = 3x 10^8 |
v = f λ |
Electrical quantities
potential difference is the work done by a unit charge passing through a component, measured between two points in volts (V) |
electromotive force (e.m.f.) is the electrical work done by a source in moving a unit charge around a complete circuit measured in volts (V) |
kilowatt-hour (kWh) 1000 watts per one hour |
1 kWh = 3.6 x 10^6 J |
resistance, the opposition of a component to the flow of electric current through it measured in ohms (Ω) |
charge is measured in coulombs, where one coloumb is he charge on 6.24 x 10^18 electrons |
R1/R2 = V1/V2 |
R total = R1 x R2 = R1 + R2 or product/sum |
Electricity
I = Q / t |
emf = W/Q |
pd = W/Q |
R = V/I |
P = IV |
E = IVt |
R1/R2 = V1/V2 |
R total = R1 x R2 = R1 + R2 or product/sum |
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Motion
Density = Mass/ Volume |
(constant) S = distance / time |
a = v-u / t |
D (while accelerating) = v+u x t |
D = area under the graph |
W = m x g |
R.F/ F = m x a |
R.F = F.F - B.F |
Moment = force x perpendicular distance from the pivot |
Pressure = force / area |
(Liquid) pressure = Density x g x height |
X = L new - L original |
F = k/x , where k is the spring constant |
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