5.4.1. Drag Force and Lift Force

Try these first

1. 1.

   What is drag force?

   Hint

   Think about forces acting against motion.

2. 2.

   Define lift force.

   Hint

   Consider forces involved in flight.

3. 3.

   What does drag force oppose?

   • The weight of the object
   • The thrust of the object
   • The motion of the object

   Hint

   Think about objects moving in fluid.

4. 4.

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

   • True
   • False

   Hint

   Consider how planes lift off.

5. 5.

   A drone weighs 1.5 kg and has a wing span of 1.2 m. Calculate the lift force required for the drone to take off considering a lift coefficient of 1.2 at a velocity of 8 m/s.

   Hint

   Use the lift equation for your calculations.

6. 6.

   An object has a drag coefficient of 0.1 and a cross-sectional area of 0.5 m². Calculate the drag force it experiences at a velocity of 15 m/s in air (density = 1.225 kg/m³).

   Hint

   Make sure to plug values accurately into the drag equation.