Which demonstration is appropriate for explaining the effect of drag as a force in flight?

The demonstration involving simultaneously dropping a crumpled and a flat piece of paper is appropriate for explaining the effect of drag because it directly illustrates how drag varies with the shape and surface area of an object. In this scenario, the crumpled piece experiences less air resistance due to its smaller surface area compared to the flat piece of paper, which presents a larger surface area to the air. This results in the flat paper experiencing greater drag and taking longer to reach the ground.

In aviation, understanding drag is crucial as it affects an aircraft's performance and fuel efficiency. The demonstration vividly showcases how different shapes and sizes influence the impact of aerodynamic forces, reinforcing the concept of drag as a significant force in flight. This visual and tangible comparison makes it easier for learners to grasp the relationship between drag and flight dynamics.