When the forces of flight are balanced, an object can fly in a level direction. An object can go up (take-off!) if the forces of lift and thrust are more than weight and drag . An object can go down (land!) if the forces of weight and drag are greater than lift and thrust.
How do objects DEFY gravity?
In other words, how can we create the lift needed to overcome weight (the force of gravity)?
Lift can overcome weight in two ways:
1) By creating differences in air pressure.
2) By pushing air downward.
But what does this even mean?!?!?! There there. I'll explain.
In other words, how can we create the lift needed to overcome weight (the force of gravity)?
Lift can overcome weight in two ways:
1) By creating differences in air pressure.
2) By pushing air downward.
But what does this even mean?!?!?! There there. I'll explain.
1) Create lift by creating differences in air pressure
Bernoulli's Principle: As the speed of a moving gas or liquid increases, the pressure within the gas or liquid decreases |
2) Create lift by pushing air downward
Newton's 3rd Law of Motion: For every action, there is an equal and opposite reaction. |
So now we have Lift. Where do we get Thrust?
That's a much easier explanation. We get thrust from engines (like a car), propellers, and rockets!
That's a much easier explanation. We get thrust from engines (like a car), propellers, and rockets!
Still confused? Watch the Bill Nye + BrainPop videos on flight (videos + links below)!
Assignment
Answer the questions below in complete sentences, using the blog post, videos, and class notes to help you. WRITE the question and answer.
Due: Friday, June 6, 2014
Answer the questions below in complete sentences, using the blog post, videos, and class notes to help you. WRITE the question and answer.
Due: Friday, June 6, 2014
1. What are the four forces of flight?
2. How does a plane balance the forces of flight in order to land safely? (hint: some forces must overcome others)
3. What is an airfoil?
4. Sketch an airfoil.
5. What is Bernoulli's principle?
6. How does Bernoulli's principle relate to flight?
7. What is another example of Bernoulli's principle in the real world? (hint: there is a poster in Ms. Shon's classroom with examples)
8. What is Newton's 3rd Law?
9. How does Newton's 3rd Law of motion relate to flight?
10. What is another example of Newton's 3rd Law of motion in the real world?
2. How does a plane balance the forces of flight in order to land safely? (hint: some forces must overcome others)
3. What is an airfoil?
4. Sketch an airfoil.
5. What is Bernoulli's principle?
6. How does Bernoulli's principle relate to flight?
7. What is another example of Bernoulli's principle in the real world? (hint: there is a poster in Ms. Shon's classroom with examples)
8. What is Newton's 3rd Law?
9. How does Newton's 3rd Law of motion relate to flight?
10. What is another example of Newton's 3rd Law of motion in the real world?