The exact formulas printed on your IGCSE exam paper: nothing more, nothing less
Edexcel · 4PH1
Physics
formulas
29
sections
8
Average Speed
v = dt
vaverage speed(m/s)
ddistance(m)
ttime(s)
Acceleration
a = v − ut
aacceleration(m/s²)
vfinal velocity(m/s)
uinitial velocity(m/s)
ttime(s)
Resultant Force
F = ma
Fresultant force(N)
mmass(kg)
aacceleration(m/s²)
Weight
W = mg
Wweight(N)
mmass(kg)
ggravitational field strength(N/kg)
On Earth, g ≈ 9.8 N/kg. Check the exam paper, as some papers use g = 10 N/kg.
Momentum
p = mv
pmomentum(kg m/s)
mmass(kg)
vvelocity(m/s)
Force & Change in Momentum
F = (mv − mu)t
Fforce(N)
mv − muchange in momentum(kg m/s)
ttime(s)
Moment of a Force
M = F × d
Mmoment(N m)
Fforce(N)
dperpendicular distance from pivot(m)
Density
ρ = mV
ρdensity(kg/m³)
mmass(kg)
Vvolume(m³)
Pressure
p = FA
ppressure(Pa)
Fforce perpendicular to surface(N)
Across-sectional area(m²)
Pressure in a Fluid
p = hρg
ppressure at depth h(Pa)
hdepth below surface(m)
ρdensity of fluid(kg/m³)
ggravitational field strength(N/kg)
Exam tip: These equations are printed on your Edexcel 4PH1 exam paper, so you do not need to memorise them. Focus on knowing how to rearrange and apply each one. Examiners reward correct working even when the final answer is wrong.