- Why was the folded edge called the leading edge? (This
was the part of the wing which lead into the airstream)
- How did removing a wing fold affect the glider behavior?
(Less weight in the front caused the center of weight to
move towards the trailing edge so the airfoil tilted down
more at the back and, in addition, the wing area was increased.
Both caused lift at a given speed to increase)
- How did adding an extra fold affect the glider's behavior?
(Exactly opposite effect to ques.2)
- What part of the glider acted as the wing? (Exactly as
before. All of it! The entire thing acted as the wing, although
the sides, being vertical, didn't contribute as much lift
as the horizontal top and bottom of the ring).
- How can you increase the lift of this design at a given
speed? (Unfolding an edge will cause the trailing edge to
drop down and the wing area to increase. Since the lift
must be the same, because the weight is unchanged, the ring
wing will fly a little slower, although this cannot be seen.)
you ever placed your hand in a stream of rushing water?
If so, what happened as you angled your finger tips in the
stream flow. (They would rise or descend within the moving
Why? (Like a wing, your hand would react to the force of impacting
Suppose you angled your hand down? (The hand would "dive"
due to the angle at which the water stream strikes the upper
surface of this extremity.)
What would happen if you keep your hand level? (It would stay
mostly at the same level)
and Forces, Bernoulli's Principle
SCIENCE STANDARDS (Grades
As Inquiry-Content Standard A
should develop abilities necessary to do scientific inquiry,
Students should develop an understanding about scientific
Science -Content Standard B
Students should develop an understanding of motions
and Technology -Content Standard E
should develop abilities of technological design
to Teaching Guide