Which demonstration effectively explains how lift acts in flight?

The demonstration of blowing across the top of a strip of paper effectively illustrates how lift acts in flight because it visually represents the Bernoulli principle, which is fundamental to understanding how wings produce lift. When air moves faster over the top surface of the paper, it creates a reduction in pressure compared to the air below. This pressure differential results in an upward force on the paper, simulating the lift generated by an aircraft's wing.

By using this method, students can see firsthand how changing the airflow over a surface can result in a change in pressure, leading to lift. It highlights the relationship between airspeed and pressure, which is crucial for understanding flight mechanics. This hands-on approach to demonstrating lift is especially effective for visual learners, making the concept more tangible and easier to grasp.

Other demonstrations, while they may illustrate principles related to flight, do not convey the specific relationship between air speed and pressure in the same direct and intuitive manner. For instance, raising a wing to show flutter does not effectively convey the overall concept of lift, but rather focuses on the effects of oscillation in the wing structure. Twisting a balloon may illustrate airflow but does not clearly show how lift is generated. Dropping a feather and a rock serves to demonstrate differences