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physics formulae (energy resources & energy transfer (efficiency =…
physics formulae
energy resources & energy transfer
efficiency = useful energy output / total energy input
work done = force x distance moved
W = F x d
gravitational potential energy = mass x g x height
GPE = m x g x h
kinetic energy = 1/2 x mass x speed²
KE = 1/2 x m x v²
energy transferred = work done
power = work done / time taken = energy transferred / time taken
P = W/t - given on formula sheet in exam
mass, weight, gravity
w = m x g
weight = mass x gravity
mass in grams or kilograms
weight in Newtons
gravity in Newtons per kilogram
forces and motion
average speed
v = distance/time
triangle
accelaration
change in velocity / time taken
a = (v-u) / t
graph
gradient = vertical / horizontal
resultant force
F = ma
Force (N) = mass (g) x acceleration (m/s)
moments
total anticlockwise moments = total clockwise moments
Moment (Nm) = Force (N) x perpendicular distance (m) from the pivot
orbital speed
2 x π x orbital radius / time period
given on formula sheet in exam
waves
speed (m/s) = frequency (Hz) x wavelength (m)
v = f x λ
f = 1/T
given on formula sheet in exam
refractive index, n = sin i / sin r
sin C = 1/N
electricity
power = current x voltage
p = l x v
voltage = current x resistance
V = l x R
charge = current x time
Q = l x t
energy transferred = current x voltage x time
E = l x V x t
given on formula sheet in exam
solids, liquids and gases
density = mass / volume
ρ = m/V
pressure = force / area
P = F/A
pressure difference = height x gravity x g
p = h x ρ x g
pressure x volume = constant
P1 x V1 = P2 x V2
given on formula sheet in exam