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WHY?
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The stick vibrates the pencil up and down, the finger of the
child vibrates it sideways. These motions combine to turn the pencil and
propeller in tiny circles. When the child moves their finger on the
other side of the stick it changes the sideways vibrations and the
direction of the spin.
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ASSESSMENT: Can the student communicate
what they observed?
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Student is able to communicate how the horizontal and vertical
vibrations can be changed to circular vibrations. The student can also
share that when they move their finger on the other side of the stick,
the propeller's direction changes.
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Student is able to communicate something about how the horizontal
and vertical vibrations can be changed to circular vibrations. The
student can also share that when they move their finger on the other side
of the stick, something changes.
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Student is able to communicate one thing about the vibrations of the
propeller.
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Student is able to communicate that the propeller turns in a
circular motion when they rub the stick back and forth along the pencil
over the bands.
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Last modified: Sat Dec 20 15:06:28 PST 1997
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