Levers, Beakmania & Television: With Paul Zaloom, Alanna Ubach, Mark Ritts. Taking a question from a student puzzled by levers, Beakman uses a teeter-totter and a large boulder to explain how these simple machines work. Noting that there are first, second and third class levers, Beakman goes on to describe their essential parts -- the fulcrum, the resistance and the effort -- and why their ... More @Wikipedia
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