 Form drag.  This is the resistance (or pushing) sensation you feel when you walk into the wind.  It is caused by all of the air molecules running.

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Presentation transcript:

 Form drag.  This is the resistance (or pushing) sensation you feel when you walk into the wind.  It is caused by all of the air molecules running into your body.

 The shape of an object,  The cross-sectional area of an object,  The speed of an object.  In the case of drag, the cross-sectional area is the area of an object that is facing the direction of its movement.

 If you hold your hand out of a car's window with your palm down, you do not feel much push from the wind.  If you turn your hand right, so that your palm faces the direction the car is moving, the wind will push your hand back much harder.  This increase in resistance (push) is due to the increase of the cross sectional area of your hand, not the overall size of your hand.

 Engineers often consider drag in designing things like airplanes and cars. They try to design these things as streamlined as possible.  Streamlined means that the shape of the object, airplane or car can reduce the drag of the object (reduce the force opposing forward motion).  This is why airplanes have rounded nose cones and why they pull up their landing gear after liftoff (to remove the wheels from being in the way and creating unnecessary drag).

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