Physics Equations Flashcards
Edexcel iGCSE
State the relationship between average speed, distance moved and time taken
average = distance moved / time taken
State the relationship between acceleration, change in velocity and time taken
acceleration = change in velocity / time taken
or
a = (v-u) / t
State the relationship between final speed, initial speed, acceleration and distance moved
(final speed)² = (initial speed)² + (2 x acceleration x distance moved)
or
v² = u² + (2 x a x s)
State the relationship between force, mass and acceleration
Force = mass x acceleration
or
F = ma
State the relationship between weight, mass and g.
weight = mass x g
or
W = m x g
State the relationship between momentum, mass and velocity.
momentum = mass x velocity
or
p = m x v
State the relationship between force, change in momentum and time taken
force = change in momentum / time taken
or
F = (mv-mu)/t
State the relationship between moment, force and perpendicular distance from pivot.
moment = force x perpendicular distance from pivot
State the relationship between power, current and voltage.
power = current x voltage
or
P = I x V
State the relationship between energy transferred, current, voltage and time
energy transferred = current x voltage x time
or
E = I x V x t
State the relationship between voltage, current and resistance
voltage = current x resistance
or
V = I X R
State the relationship between charge, current and time
Charge = current x time
or
Q = I x t
State the relationship between voltage , energy and charge.
voltage = energy / charge
or
V = E/Q
State the relationship between wave speed, frequency and wavelength
wave speed = frequency x wavelength
or
v = f x λ
State the relationship between frequency and time period.
frequency = 1 / time period
or f = 1/T
State the relationship between the refractive index and the angles of incidence and refraction.
n = sin i / sin r
State the relationship between the critical angle and the refractive index.
sin c = 1 / n
State the equation for efficiency.
efficiency = (useful energy output / total energy input) x 100%
State the relationship between work done, force and distance moved.
work done = force x distance moved
or
W = F x d
State the relationship between gravitational potential energy, mass, gravitational field strength and height.
gravitational potential energy = mass x gravitational field strength x height.
or
GPE = mgh
State the relationship for kinetic energy, mass and speed
kinetic energy = 1/2 x mass x speed²
or
KE = 1/2 x m x v²
State the relationship between power, work done and time taken
Power = work done / time taken
or
P = W/t
State the relationship between density, mass and volume.
density = mass / volume
or
ρ = E/A
State the relationship between pressure difference, height, density and gravitational field strength
pressure difference = height x density x gravitational field strength
or
p = h x ρ x g
State the relationship between change in thermal energy, mass, specific heat capacity and change in temperature
change in thermal energy = mass x specific heat capacity x change in temperature
or
ΔQ = m x c x ΔT
State the relationship between pressure and temperature.
p1/T1 = p2/T2
State the relationship between pressure and volume.
p1V1 = p2V2
State the relationship between input and output voltage; and primary and secondary turns
input voltage / output voltage = primary turns / secondary turns
Vp/Vs = np/ns
State the relationship between input power and output power
for 100% efficiency:
input power = output power
or
VpIp = VsIs
State the relationship between orbital speed, orbital radius and time
orbital speed = 2 x π x orbital radius / time period
or
v = 2 x π x r / T
State the relationship between change in wavelength, reference wavelength, velocity of a galaxy and speed of light.
change in wavelength / reference wavelength = velocity of a galaxy / speed of light
or
λ - λ0 / λ0 = Δλ / λ0 = v/c
