character: Leonardo da Vinci
topic: Studies on Falling Bodies
grade: 9
subject: Physics
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character: Galileo Galilei
topic: Principles of Motion
grade: 9
subject: Physics
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character: Isaac Newton
topic: Law of Universal Gravitation
grade: 9
subject: Physics
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character: Aristotle
topic: Early Theories of Motion
grade: 9
subject: Physics
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