Equations Flashcards
Average speed =
average speed = distance /time
Acceleration a =
Acceleration = change in velocoty /
time
a = v-u / t
eqn of motion
v2 =
v2 = u2 + 2as
Resultant Force F =
F = ma
Weight W =
W = mg
Momentum p
p = mv
equation linking force and momentum
F =
force = change in momentum / time
Moment =
Moment = force x perpendicular distant from pivot
Power P =
Power = Energy transferred / time Power = work done / time P = I x V
Voltage V
V = I x R
Charge Q =
Q = I x t
Energy transferred E =
Energy transferred = work done
E = Q x V
or
V = E/Q
Wave speed v =
wave speed = frequency x wavelength
frequency f =
frequency = 1 / Time period f = 1 / T
refractive index n =
n = sin i / sin r
critical angle equation
sin c = 1 / n
efficiency =
efficiency = useful energy output / total energy input
work done W =
W = F x d Work = force x distance
GPE =
GPE = mgh
KE =
KE = 1/2 m v2
density p
density p = mass / volume
Pressure p =
pressure = force / area p = F/A
Pressure in a liquid p =
p = depth x density x gravity p = p x g x h
Change in thermal energy =
Change in thermal energy = mass x SHC x change in temp
ideal gas law for constant volume and mass
p1 / T1 = p2 / T2
ideal gas law for constant pressure and mass
p1 V1 = p2 V2
transformer turns and voltage equation
V primary / V secondary = N primary / N secondary
transformer power eqn
Vp Ip = Vs Is
oribtal speed =
v = 2 x pi x r / T
Doppler shift for galaxies
change in wavelength / original wavelength = vel of galaxy / speed of light
