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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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## Flight

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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

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