IGCSE Edexcel Physics Formulae

average speed

= distance/time

acceleration

= v - u/ (delta) t

v²

final velocity²

= u² + 2as

= initial velocity² - (2 x acceleration x displacement)

efficiency

= (useful energy output/ total energy input) x 100

v

wave speed

= f x λ

= frequency x wavelength

frequency

= 1 / T

= 1 / Time period

F

Force

= m x a

= mass x acceleration

W

Weight

= m x g

= mass x gravitational field strength

ρ

pressure

= F / A

= Force / Area

p

pressure difference

= h x ρ x g

= height x pressure x gravitational field strength

v

Orbital Speed

= (2 x π x r) / T

= 2 x π x orbital radius / Time period

(change in wavelength) / (reference wavelength)

= (velocity of a galaxy) / (speed of light)