• Second moment of area moment of inertiaSecond area moment calculation and radius of gyration of common shapes about weak and strong axes
  • Cubic orientation of primary and shear stresses and principal stress cosine rotationCombine primary and shear stresses into equivalent and principal stresses & their cosines
  • Nucleus and electron shells of atomic elementFind, sort and reorganise the properties of nature's atomic elements with active periodic table
  • Formulas included in Engineering PrinciplesCalculate unknowns in principle engineering formulas: stress, moments, power, energy, capstans, fluids, etc.
  • Properties of a triangle with inscribed and circumscribed circlesCalculate the properties of triangles and triangular configurations including inscribed and circumscribed circles
Area Moment calculation1 Combined Stress calculation2 Elements database3 Engineering Principles calculation4 Trigonometry calculation5
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Work, Energy, Power, Torque, etc. (relationships)

{units} are provided for information only
The following relationships apply to any and all consistent units, both metric and Imperial
The symbol ᶜ refers to radians


Momentum (p) = m.a.t = m.v {kg.m/s}

Force (F) = m.a {kg.m/s²}

Energy (U) = F.d = m.a.d {kg.m/s² . m}

Potential Energy (Uᴾ) = m.a.d {kg.m²/s²}

Kinetic Energy (Uᴷ) = ½.m.v² {kg.m²/s²}

Deformation Energy (Uᴰ) = ½.m.a.y {kg.m/s² . m}

Work (W) = Energy {kg.m²/s²}

Power (P) = m.a.d / t {kg.m/s² . m / s}

Energy = Work = Power . t = Momentum . v

m = mass {kg}
a = acceleration {m/s²}
d = distance {m}
y = deformation {m}
v = velocity {m/s}
t = time {s}


Inertia (I) = ⅖.m.R² {kg.m²}

Torque (T) = m.α.R² {kg . ᶜ/s² . m²}

Energy = ½.I.ω² = ½ . ⅖.m.R² . ω² = ½ .⅖ . m.(ω.R)² [= ⅕.m.v²] {kg . ᶜ²/s² . m²}

Work = 2π.T {ᶜ . kg.m²/s²}

Power = 2π.N.T = ω.T {ᶜ/s . kg.m²/s²}

Energy = 2π . Work = 2π.t . Power = (2π)² . Torque

m = mass {kg}
α = angular acceleration (ᶜ/s²)
R = radius {m}
v = rotational velocity at the surface of the mass {m/s}
ω = angular velocity {ᶜ/s}
t = time {s}
2π.t = angular period {ᶜ.s}

Further Reading

You will find further reading on this subject in reference publications(1, 2, 3 & 4)

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