PURPOSE: To show how force components can be used to sail against the wind.
DESCRIPTION: A sail is attached as shown to an air track glider. Wind from a fan blows the sailboat in the direction from which the wind is coming if the angle between the wind and the sail is correct.
Click your mouse on the photograph above to see a video of the action. After the video begins, (a) the air cushion is turned on, then (b) the air gun is started, creating the force situation shown in the drawings below.
SUGGESTIONS: See Question of the Week #86 for information on using this demonstration to enhance class involvement.
REFERENCES: (PIRA 1J30.60)
EQUIPMENT: Air track, glider with sail, and fan, as photographed.
SETUP TIME: 10 min.