ALL EQUATIONS :DEVIL: Flashcards
Paper1: KE
KE = 1/2mv^2
Paper1: GPE
GPE = mgh
Paper1: Workdone
Work done = force * Distance
Paper1: Power energy transfer
Power(Watts) = Energy transferred(Joules)/Time
Paper1: Power for work done
P = Work done/time
Paper1: Efficiency energy/power
useful energy output/total energy input for energy
and for power: useful power output / total power input
Paper1: Charge flow
Q = It or Charge(Coulombs) = Current x time
Paper1: Potential Difference
V = IR or Voltage = Current x Resistance
Paper1: Power using voltage
P = VI or Power = Potential difference x current
Paper1: Power using resistance
P = I^2 x R or current squared x resistance
Paper1: Energy transferred using power
E = Pt or Energy transferred = Power x time
Paper1: Energy transferred using charge
E = QV OR Energy transferred = Charge x Potential Difference
Paper1: Density
p = m/V or Density(kg/m^3) = mass/ Volume
Paper1: Specific Heat Capacity
E = mc0 or change in thermal energy = mass x specific heat capacity x temp change
Paper1: Specific Latent Heat
E = mL or Energy transferred = mass x specific latent heat
Paper1: weight
W = mg
Paper1: Force (Hooke’s Law)
F = ke or Force = spring constant(N/m) x Extension
Paper1: Moment of a force
M = Fd or Moment(Nm) = Force x Distance
Paper1:Pressure for Liquids and Solids
Pressure in pascals = force / area
Paper1:Pressure in a liquid
p = hpg or Pressure = depth x Density (kgm^3) x Gravitational field strength
Paper1:Acceleration
Acceleration = Change in velocity/ Time
Paper1:Newtons Second Law
F = ma
Paper1:Momentum
P = mv or Momentum = mass(kg) x velocity(m/s)
Paper1:Force(Momentum Change)
F = Change in momentum / Time
Paper2: Distance, Speed, and Time
Speed = Distance/Time
Paper2: Acceleration
Acceleration = Change in velocity/ time
Paper2: Newton’s Second Law (Force, Mass, Acceleration):
Force = Mass x Acceleration
Paper2: Momentum:
Momentum - mass x velocity
Paper2: Force & Change in Momentum:
Force = Change in momentum / time
Paper2: Wave Speed:
wave speed = frequency x wavelength or v=fλ
Paper2: Period of a Wave:
1/frequency
Paper2: Refractive Index (Snell’s Law)
n = sin i / sin r or the refractive angle = Angle of incidence / angel of refraction
Paper2: Magnetic Force on a Current-Carrying Wire (Motor Effect):
F=BIL or Force = Magnetic field Strength(Tesla) x Current x Length of the wire
Paper2: Transformer Equation:
Vp/Vs=Np/Ns
V = Voltage
N = Number of turns
p = primary
s = secondary
Paper2: Power in Transformers (If 100% Efficient):
VpIp = VsIs
V = Voltage
p = primary
s = secondary
Paper2: Orbital Speed:
v = 2πr/ T
v = orbital speed (m/s)
T = orbital periods