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# Flight!

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## jasmynne muzyk

on 21 June 2013

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#### Transcript of Flight!

Flight
By: Jasmynne and Gabby
Laws of Flight
The Wing
Hot Air Balloons
Airships
Gas and Air
Laws of flight
Bernoulli’s laws of pressure:
The faster the air flows the less pressure it has
When air is moving it creates areas of  low and high pressure
Low pressure particles are spread far apart
High pressure particles are close together
Laws of flight
Objects always go from high pressure to low pressure
The air in a plane is high pressure to make the passenger feel comfortable
When a hole is made in the body of a plane, the plane moves violently.
Newton’s Third Law
Force in one direction there is an equal force in the opposite direction.
This law helps to explain how rockets and jet engines work
Laws of flight
Bernoulli’s laws of pressure:
The faster the air flows the less pressure it has
When air is moving it creates areas of  low and high pressure
Low pressure particles are spread far apart
High pressure particles are close together
Laws of flight
Objects always go from high pressure to low pressure
The air in a plane is high pressure to make the passenger feel comfortable
When a hole is made in the body of a plane, the plane moves violently.
Newton’s Third Law
Force in one direction there is an equal force in the opposite direction.
This law helps to explain how rockets and jet engines work

- Gas is not a liquid or solid
- Air is made up of three main gasses ; nitrogen, oxygen & carbon dioxide
- When gasses heat, particles move faster & become farther apart
- Expand and may explode

- Modernly made of nylon & use propane heater
- To get balloon to come down, a flap is pulled that lets out hot air of the nylon balloon
- Main problem with hot air is once they are in the air, they are almost impossible to control
- They go wherever the wind blows them

- 1900- people found that if you filled balloons with gasses that were lighter than the gasses in the air the balloon would rise
- Gas called hydrogen was used at first, but later found that it explodes if comes into contact with spark or flame
- 1937 airship filled with hydrogen burned, and killed 36 people
- Commonly used gas helium (doesn’t burn, safer than hydrogen, used in other balloons)
- Sometimes given medal frames for support
- Added propeller that helps to travel around
- Lighter-than –air-balloons main purpose is advertising
Four Forces of Flight
Gravity
Drag
Lift
Thrust
- Invisible
- Pulls objects together
- Objects with large mass pull and attract objects with less mass
- Slows you down & works in the opposite direction than you are traveling
- Upward force
- If this force is greater than gravity (force), the object will stay in the
air
- This is the force that moves an airplane forward (produced by the planes engine)
Bernoulli’s laws of pressure:
- The faster the air flows the less pressure it has
- When air is moving it creates areas of  low and high pressure
- Low pressure particles are spread far apart
- High pressure particles are close together
Laws of flight
- Objects always go from high pressure to low pressure
- The air in a plane is high pressure to make the passenger feel comfortable
- When a hole is made in the body of a plane, the plane moves violently.
Newton’s Third Law
- Force in one direction there is an equal force in the opposite direction.
- This law helps to explain how rockets and jet engines work

- Air hits the front of wing (leading edge) and splits up
- Air flowing over curved top of wing has further to go than flat bottom of the wing
- Streams of air reach back of wing (trailing edge) at same time, the top stream might travel faster than the bottom
- Fastest moving air creates low pressure and a high pressure on bottom wing ( Bernoillies Law)
- Objects tend to form high to low pressure, lift is created, which is how birds & planes stay in the air
Kites and How They Fly
Delta Kites
Box Kites
Bag Kites
- Delta Kites made of string attached to piece called keel which keeps it stable
- Deltas are easy, cheap, and commonly sold in stores
- Box Kites made with plastic film or paper which wraps around a wooden frame
- Box Kites require strong & steady wind to fly
- Box Kites are sometimes joined together to make “giant kites”
- Some Box Kites are able to lift a person
- Bag Kites are simple to build
- Bag Kites just require 2 sticks
- Kites rely on force to fly
- High pressure on front side
- Low pressure on back side
- Air is squeezed together
Jet Driven
Propeller Driven
Airplanes
1. Work by turbine in front spins & draws cold outside air
2. Air mix’s with jet fuel
3. Spark lights jet fuel & air heats to very high temperature - air expands
4. Spinning turbine in front stops heated air from going out of the front so it escapes out the rear engine
5. The escaping gas go backwards sending plane
forwards
1. Most small airplanes are propeller driven
2. Propeller moves the plane through air & wings create lift
3. When propeller spins, it “bites” into air in the front of plane and push it towards the back
4. Causes plane to move forwards, moving air over the wings and creating lift
5. Engines used are similar to the engines used to
power cars
Helicopters
- Gets lift from spinning blades that are attached to top of helicopter (“rotors”)
- Main rotor allows to lift straight up in air without runway
- “Hovers” to remain in same place without the air moving
Rockets
- Been around for long time, first used in Asia & were gun powder was invented
- in the 1920’s Robert Goddard built first rocket by mixing two liquids for fuel
- World War II Germany invented better liquid fueled rockets
- World War II the rockets were able to travel hundreds of miles
- U.S & Russia came up with next big step in rocket development, were now able to carry nuclear warheads, launch satellite & for space exploration
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