1107科豆手推車1720 1840-
TRANSCRIPT
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Levers
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Classes of levers
• Class 2: Resistance in the middle: the effort is applied on one side of the resistance and the fulcrum is located on the other side, for example, a wheelbarrow or a nutcracker or a bottle opener.
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Type 2 lever
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力 * 力臂 = 力矩
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Nutcracker
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Bottle opener