The simplest approach yet to this basic experiment in mechanics. By squeezing the “ears" of the release unit the ball bearing is released and the circuit connections to a timer are broken at the same instant. The base unit is a sensitive microswitch “trapdoor" giving either make or break contacts at the moment of impact. No power supplies are required, just a sensitive timer such as the Lascells Timer PY3080 (stopclocks are not suitable). Connections by 4mm leads.
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