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WHY?
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A boat that is not steered, such as the sailboat that you made,
travels in a direction that depends only on the wind. When the wind
blows, increased drag caused by the wide surface of the sail pushes the
boat and makes it move. The wind's effect can be controlled by changing
the design of the sail. The shape of the sail, the number of sails, and
the location of the sails on the boat all affect how a sailboat travels,
as each variation catches the wind differently. New sailboat designs are
tried every year as people try to make their sailboats move faster
through the water. The shape of sails has changed as well. Some sails
are even shaped like airplane wings.
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ASSESSMENT: Can the student communicate
what they observed?
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