5.4.2.1. Experimental Methods

Try these first

1. 1.

   What is a system in fluid mechanics?

   Hint

   Think about the mass of fluid you are analyzing.

2. 2.

   Define drag force.

   Hint

   Relate this to the wind pushing against a moving car.

3. 3.

   What defines a control volume?

   • A fixed amount of matter
   • A space defined for fluid flow analysis
   • An unbounded system

   Hint

   Think about where the fluid flows.

4. 4.

   The drag force is responsible for which of the following?

   • True
   • False

   Hint

   Consider whether drag helps or hinders movement.

5. 5.

   A wind tunnel test shows a drag force of 5 N and a lift force of 8 N on a model. Calculate the resultant force acting on the model and discuss its implications for design.

   Hint

   Use the Pythagorean theorem to find the resultant force.

6. 6.

   Describe how you would set up an experimental study to understand lift forces on an airplane wing in a wind tunnel. Include considerations for scaling and measurements.

   Hint

   Think about model dimensions and flow speeds relative to real aircraft.