| Results |
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| n | Exam Problem |
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| n | 90% give the
correct answer |
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| n | the normal force
on the ball is equal to the downward force |
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| due to gravity |
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| n | FCI 18 |
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| n | 54% choose the
correct answer: |
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| n | the upward force
on the elevator by the cables |
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| equals the
downward force due to gravity |
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| n | 36% choose a
common misconception: |
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| n | the upward force
on the elevator by the cables |
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| is greater than
the downward force due to gravity |
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| 24 |
