Machine and types and uses of simple machines - Khan Academy
https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:forces-and-machine/x0c8b40bd4b242f0b:machine-types-and-uses-of-simple-machines/e/machine-and-types-and-uses-of-simple-machines
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