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Discuss with the class the dynamic that takes place when a
knuckleball's flow goes from turbulent to laminar flow because of the
stitches on the baseball. Pass around a baseball so that each student
can feel the stitches on the ball.
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Emphasize the terms under 'Words to Know' so that the students have
an understanding of the words you are using to explain to them the flow
of the knuckleball.
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Continue the discussion until everyone has a grasp of the altering
state of flow from laminar to turbulent as well. The laminar flow will
separate earlier than the turbulent flow.
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Also, using saliva or Vaseline causes the pitch to slide through the
fingers and thus have little spin. Therefore, the ball moves like a
knuckleball, but at the speeds of a fastball. This makes a spitball next
to impossible to hit. (Refer to the Teacher's Text for the information
needed for your discussion with the class).
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Pass out graph paper and ask the students to make a Venn Diagram of
the overlapping flow from laminar to turbulent that the knuckleball goes
through. Have the students use the protractors to make the overlapping
circles. Ask the students to label the two parts: laminar and turbulent
and the overlapping asymmetry.
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Display the Venn Diagrams on a Bulletin Board in the classroom.
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