Momentum

Momentum

1. Newton's second law of motion

   • F=m*a
   • Derivation

2. Linear Momentum Equation

   • F=Mo*Vo - Mi*Vi
   • Sum of forces= rate of momentum out - rate of momentum in
   • vector quantity
   • When the flow velocity is uniform over an inlet or exit section of the CS, the integral operations are simplified.

3. Momentum flow describes the rate at which the flowing fluid transports momentum across the con trol surface.

4. Application of the Linear Momentum Equation

   • The forces involved in the equation are body and surface forces that act on what is contained in the control volume
   • When the flow velocity is uniform over an inlet or exit section of the CS, the integral operations are simplified.
   • The external forces have an algebraic sign, positive if the force is in the assigned positive coordinate direction and negative otherwise.

5. Force exerted on a fluid = rate of change of momentum

6. Steps to work out a problem

   • 1. choose CV. 2.Coordinate 3. Draw FBD. 4. Write Eqn and solve

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