Word Equations Flashcards
W = m g
Weight = mass x gravitational field strength
W = F s
Work done = force x distance
F = k e
Force applied to a spring = spring constant x entension
M = F d
Moment of a force = force x distance
P = F/A
Pressure = force normal to a surface / area of that surface
s = v t
Distance travelled = speed x time
a = △ v / t
Acceleration = change in velocity / time taken
F = m a
Resultant force = mass x acceleration
p = m v
Momentum = mass x velocity
E ₖ = 1/2 m v^2
Kinetic energy = 0.5 x mass x (speed)^2
E ₚ = m g h
Gravitational potential energy = mass x gravitational field strength x height
P = E / t
Power = energy transferred / time
P = W / t
Power = work done / time
Efficiency (1) = (energy transfer)
Efficiency = useful output energy transfer / total input energy transfer
Efficiency (2) = (power input)
Efficiency = useful power output / total power input
v = F λ
Wave speed = frequency x wavelength
Q = I t
Charge flow = current x time
V = I R
Potential difference = current x resistance
P = V I
Power = potential difference x current
P = I^2 R
Power = (current)^2 x resistance
E = P t
Energy transferred = power x time
E = Q V
Energy transferred = charge flow x potential difference
P = m / V
Density = mass / volume
p = h p g
Pressure due to a column of liquid = height of column x density of liquid x gravitational field strength (g)
v^2 - u^2 = 2 a s
(Final velocity)^2 - (initial velocity)^2 = 2 x acceleration x distance
F = m △ v / △ t
Force = change in momentum / time taken
E ₑ = 1/2 k e^2
Elastic potential energy = 0.5 x spring constant x (extension)^2
△ E = m c △ 0
Change in thermal energy = mass x specific heat capacity x temperature change
Period = ?
Period = 1 / frequency
Magnification = ?
Magnification = image height / object height
F = B I l
Force on a conductor (at right angles to a magnetic field) carrying a current = magnetic flux density x current x length
E = m L
Thermal energy for a change of state = mass x specific latent heat
Vₚ / Vₛ = Nₚ / Nₛ
Potential difference across primary coil / Potential difference across secondary oil = Number of turns in primary coil / Number of turns in secondary coil
Vₛ Iₛ = Vₚ Iₚ
Potential difference across primary coil x current in primary coil = Potential difference across secondary coil x Current in secondary coil
p V = constant
(For gases) pressure x volume = constant
