1. How things fly
The Four Acting Forces In order for airplanes or birds to fly two things are needed, lift and thrust. Unfortunately, these forces don't come out of the blue; they must be created. Humans create them by adding wings for lift and engines for thrust. ... is off, lift-off, gain airspeed, then climb. The diagram to the right shows these steps. For birds, they have three different way of takeoff. One, they could dive from cliffs and soar away. Two, they could run fast while flapping wings and three, they could jump using their leg muscles, flap wings quickly and fly off. The Four Air Movements ......
- Word Count: 931
- Approx Pages: 4
- Grade Level: High School