Part of ME-04 — Work, Energy & Power

Dimensional Analysis Drill

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Dimensional Formulae Summary

QuantityFormulaDimensionsSI Unit
Work/EnergyW = Fd[M^{1}$$L^{2}$$T^{-2}]J
Kinetic Energy½mv2mv^{2}[M^{1}$$L^{2}$$T^{-2}]J
Gravitational PEmgh[M^{1}$$L^{2}$$T^{-2}]J
Spring PE½kx2kx^{2}[M^{1}$$L^{2}$$T^{-2}]J
PowerW/t[M^{1}$$L^{2}$$T^{-3}]W
Spring constantF/x[M^{1}$$L^{0}$$T^{-2}]N/m
Momentummv[M^{1}$$L^{1}$$T^{-1}]kg·m/s
ImpulseFΔt\Delta t[M^{1}$$L^{1}$$T^{-1}]N·s
Coefficient of restitutionv_sep/v_appDimensionless
EfficiencyP_out/P_inDimensionless

Dimensional Analysis Checks

  1. P = Fv: [F][v] = MLT2T^{-2} × LT1T^{-1} = ML^{2}$$T^{-3}
  2. KE = p2p^{2}/2m: [p]^{2}/[m] = (MLT1T^{-1})^{2}/M = M^{2}$$L^{2}$$T^{-2}/M = ML^{2}$$T^{-2}
  3. v = √(gR): [g][R] = LT2T^{-2} × L = L^{2}$$T^{-2}, so √(gR) = LT1T^{-1} = m/s ✓
  4. W_friction = −μmgd: μ dimensionless, [mgd] = M × LT2T^{-2} × L = ML^{2}$$T^{-2}

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