Lascells 'g' by Free Fall

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 millisecond timer with any START and STOP triggering.
Connections by 4mm leads.

See millisecond timer below.