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Discuss with the students the material under the Teacher Text and the
Overview. Make sure that the students have at least some understanding
of the concept of the center of gravity.
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Decide if you want the students to do this experiment in groups of 2
or 3 and have enough materials for each group.
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Proceed, after you divide the class into groups, to do the
experiment. The following steps to be followed: space the rubber bands
evenly around the lid, stick the marbles to the inside edge of the lid
with clay (this is the wheel), fold the cardboard to make a ramp and
place the wheel at the bottom of the ramp, and then release the wheel -
it rolls up the ramp and stops near the top.
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Make sure that each student has a turn placing the wheel at the
bottom of the cardboard and seeing it go up the cardboard by itself.
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Ask the students to write a short paper on why the wheel is able to
go up the cardboard on its own.
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