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LessonTechnologyBeginner

Four Little Pins — How does a key open a lock?

A lock is four little pins of different lengths, and a key is nothing but four heights that push every one of them onto the same hidden line. Open a padlock with no key at all, find out what jams it, cut a key of your own, and then try the lock on your own front door.

10 min15 questionsGrades 4, 5, 65.0(1 ratings)

VCreated byViafocus

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