A)The first description of lever:
Displaying a picture of heavy object and asking them how can we hold it or move it.
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Collect their responses and make comments.
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Open a discussion about man in the past
and how he could perform the heavy tasks.
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Helping them to reach the conclusion that :
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Levers were the first machines man invented.
Levers were first described by the Greek scientist "Archimedes" in the year 260 B.C
