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Momentum Equation

• Continuity equation does not involve pressure
• Pressure ⇒ Force ⇒ Change in momentum ⇒ Change in velocity
Force = d(momentum)/dt      What Newton said
Force = d(mv)/dt   but only applies if    m=const.
F = m dv/dt
                        F = ma
• We apply F = ma to the fluid by summing the forces acting on a single infinitesimally small particle of fluid

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