Alyssa's+four+fources+of+flight

=__Alyssa's four forces of flight__=

FOUR FORCES:

 * What are the four forces that affect an airplane?
 * Write the definition of each force
 * Describe what each one does to an airplane
 * How is thrust generated on an airplane?
 * Which of Newton’s Laws is used to thrust an airplane forward?
 * How is lift generated on an airplane?
 * What is an air foil?
 * What “principle” is thought to create the lift on an airplane?
 * What does drag do to an airplane?
 * Which of Newton’s Laws describes how drag slows down an airplane?
 * What is needed to keep a plane flying through the air?

The Four Forces
The four forces are weight, lift, thrust and drag. Weight is the downward pull the exists on all objects. Lift is an upward pull. Thrust is any force that makes the plane move forward. Drag is the resistance of air against anything that trys to go through it. Weight pulls the plane down therefore lift must me greater than or equal to weight. For a plane to move forward thrust must be greater than or equal to drag. Thrust is generated when the engine sucks the air through the front and releases it out the back causing the plane to move forward. Newtons third law is used to thrust an airplane forward. Lift is generated because of the airfoil in the planes wing. An airfoil is a piece in the wing of an airplane similar to the shape of a birds wing.The Bernouli's principle is thought to create lift generated on an airplane. Drag creates resistance on an airplane which works against the thrust and lift of an airplane. Newtons first law describes how drag works and what it does to slow down an airplane.To keep an airplane flying you must have an engine, thrust must be greater than or equal to drag and lift must be greater than or equal to weight.