17.3.1. Experimental Methods

Try these first

1. 1.

   Define drag in fluid mechanics.

   Hint

   Think about resistance in fluids.

2. 2.

   What is the lift force?

   Hint

   Opposite to drag.

3. 3.

   What is the definition of drag in fluid mechanics?

   Hint

   Think about how air resists the motion of a moving object.

4. 4.

   True or False: Lift acts parallel to the direction of fluid flow.

   • True
   • False

   Hint

   Consider the direction it works against in flight.

5. 5.

   A cyclist has a drag coefficient of 0.9, a frontal area of 0.5 m², and is traveling at 12 m/s. Calculate the drag force they experience if the density of air is 1.225 kg/m³.

   Hint

   Substitute values into the formula correctly.

6. 6.

   A wind turbine has a drag coefficient of 0.5 and a total frontal area of 20 m². If the wind speed is 10 m/s, calculate the force acting on it assuming the air density is 1.225 kg/m³.

   Hint

   Remember to compute for the area and square the velocity.