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A teeter-totter is the perfect demonstration of the lever, particularly if you are trying to ride a teeter-totter with someone heavier than you. Such is the Principle of the Lever.
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- verified Status: Ended
- person By: Unknown
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- tag Season: Season 2
- timer Episode Runtime: 5 Mins
- star Rating: 0 / 10
- visibilityViews: 1 views
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