In a hand pump, the long handle is a lever, and the piston acts like an inclined plane with its threads. The wheel of a bullock cart? That's basically a pulley on an axle, reducing friction so it can turn smoothly. It reminds me of our old well at home, where the rusty pulley groans like my Achan when he lifts the copra sacks—both use these simple principles to make a heavy job a little lighter.
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