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Forces Acting on Flying Objects. Flight. 4 Forces . 4 Forces that allow objects to fly Thrust - forward Drag- back Gravity- down Lift- up. GRAVITY. Gravity- downward force The plane and the earth are pulling on each other because of the force called gravity. . LIFT. Lift
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4 Forces 4 Forces that allow objects to fly • Thrust - forward • Drag- back • Gravity- down • Lift- up
GRAVITY Gravity- • downward force • The plane and the earth are pulling on each other because of the force called gravity.
LIFT Lift upward force We would like to be able to raise the plane up into the air - and we call that lift.
DRAG Drag- • backward force • When the plane starts rolling there will be friction between the air and the plane - and we call that drag. When the plane starts flying there will still be drag, and lots of it!
THURST Thrust- • forward force • The forward movement that allows the plane to get off the ground! Uses the engines to generate the power needed.
Characteristics of Air • 1. Air takes up space. • 2. Air has weight. • 3. Air has pressure. • 4. Air expands when heated. • 5. Air can be compressed to lift objects. • 6. Gravity acts on all forces equally.
Examples of Floaters Objects that use air to support them as they drift to the Earth Examples: • Balloons • Bubbles • Seeds • Frisbees • Parachutes.
Examples of Gliders Animals and human-made objects that use design to prolong their time in the air Examples: • Hang gliders • Kites • Certain mammals
Examples of Flyers Animals and machines able of moving from location to location through the use of thrust Examples • Birds • Insects • Airplanes • Helicopters • Rockets.
Modes of Transportation • Airplanes • Commercial • Private • Helicopter • Spacecraft • Hot-air balloon
Types of Planes Modern airplanes are divided into five main types: 1. Commercial Transport Planes2. General Aviation Planes3. Military Planes4. Sea Planes5. Special Purpose Planes