All Equations Flashcards
Constant motion
D = st
Acceleration with velocity and time
A = v-u/t
Weight and mass
W = mg
Density - kg/m^3
ρ = m/v
Force with acceleration
F = ma
Terminal velocity
W = air resistance
Hooke’s law
F = kx
K = spring constant/N/m
X = extension/m
Moment of a force- Nm
τ = Fd
F = perpendicular force
Principle of moments
F1 x d1 = f2 x d2
Total clockwise moments = total anti-clockwise moments
Mechanical work done - change in energy/J
ΔE = fd
Kinetic energy
1/2 x m x v^2
GPE/J
E = mgh
Power with work done
P = ΔE/t
Pressure with area/Pa
P = F/A
Pressure due to liquid
p = ρhg
Boyles law- pressure and volume relationship
pV = constant
p1 x V1 = p2 x V2
Specific heat capacity/J/kg degrees c
c = E/mΔt
Thermal capacity/ J/degrees c
thermal capacity = m x c
Thermal capacity = E/Δt
Q = total heat
Specific latent heat/J/kg
L = E/m
E = total energy
M = mass change
Current with charge
I = Q/t
Ohms law
V = IR
V directly property to I
R = resistance/ohms(Ω)
Voltage with charge
V = E/Q
E = energy
Q = charge/coulombs
Current in series
The same everywhere
Voltage in series
V1 = V2+V3
V1 = emf
Power with voltage and current
P = IV
Power with resistance and voltage
P = v^2/R
Power with current and resistance
P = I^2 x R
Energy with power and time
E = pt
E = IVT
Momentum
P = mv
P = momentum
Mv = mass x volume
Force with change in impulse
F =Δp/t
P = momentum
impulse(change of momentum) / kgm/s
ΔP = FΔt
Conservation of momentum
M1xV1 = M2xV2
Total momentum - add when going same direction
- minus when opposite direction
Wave speed with wavelength
V = fλ
f = frequency
λ= wavelength
Frequency with time
F = 1/t
Refractive index with speeds of light
n = c/v
c = speed of light (vacuum)
v = speed of light (medium measured)
Refractive index with critical angle
n = 1/c angle
Refractive index with angle of incidence
n = sin(i)/sin(r)
i is always the bigger angle
Left hand rule
Motor effect
Thumb - force
First finger - field
Second finger - current
Right hand rule
Generator effect
Power in a transformer
IV = IV
Voltage and turns in a transformer
Vp/Vs = Np/Ns
Impulse with mass
M(v-u)
