12-13-2023, 01:12 PM
I looked for a way to replace the trapdoor in the standard measurement of g by falling object, a ball bearing held by an electromagnet that falls and breaks a circuit to stop the clock.
Without a working trapdoor it looked impossible but using the phyphox app stopclock timing between two audio events I did manage to produce a working experiment.
The second sound that stops the timer is just the ball bearing hitting the table.
For the trigger of the first sound to start the timer it has also to release the ball by breaking the circuit to the electromagnet.
I didn't figure out a circuit in time to do that and I had 5 minutes to do this.
But used two 100g mass hangers with large metal bases as part of the circuit and the trigger sound is breaking the circuit by essentially treating them as giant "tiddlywinks" so that by breaking the circuit the metal base also produces and almost instantaneous trigger sound.
"almost instantanieous " of course but very very small time difference.
Although I had working light gates in use as welll the exercise was to have a few examples to hand and it did produce some very good interest in the app and with appropriate initial settings it worked each time.
Without a working trapdoor it looked impossible but using the phyphox app stopclock timing between two audio events I did manage to produce a working experiment.
The second sound that stops the timer is just the ball bearing hitting the table.
For the trigger of the first sound to start the timer it has also to release the ball by breaking the circuit to the electromagnet.
I didn't figure out a circuit in time to do that and I had 5 minutes to do this.
But used two 100g mass hangers with large metal bases as part of the circuit and the trigger sound is breaking the circuit by essentially treating them as giant "tiddlywinks" so that by breaking the circuit the metal base also produces and almost instantaneous trigger sound.
"almost instantanieous " of course but very very small time difference.
Although I had working light gates in use as welll the exercise was to have a few examples to hand and it did produce some very good interest in the app and with appropriate initial settings it worked each time.
