L> Freefall Experiment with Spark TimerFreefall Experiment v Spark Timer
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A 10,000 volt spark timer places spark dots on a waxed ice cream as things falls freely. At best is a photo of the marks inserted on the waxed tape. It is add by an actual set of distance data measured native the spark locations.

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y(cm)1.80
3.00
4.48
6.28
8.32
10.68
13.22
16.08
19.20
22.60
26.32
30.25
34.50
39.00
43.52
48.58
54.10
59.52
65.50
71.60
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The plot that the measured street data over gives an impressive quadratic curve, just as the activity equations predict because that a constant acceleration.

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Taking differences between the measured distances in pairs and dividing by 1/60 second gives this velocity curve. The is typically a right line as predicted by v=gt, but you can see deviations i m sorry we associated with a slight rocking movement of the bob together it falls.

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Now acquisition differences between the calculated median velocities and also dividing by 1/60 second gives a plot the the average acceleration together a function of time. The hardly looks like consistent acceleration, however we have actually several great excuses. First, the life measurement data has now been multiplied by 3600, accentuating any type of measurement uncertainties. Second, the rocking of the fallout’s bob the became noticeable in the velocity plot over is further accentuated in the acceleration plot. But the rocking movement is periodic and also tends come cancel out in the average value the the acceleration, and also the mean acceleration obtained from the 19 place measurement to be 980.00 cm/s2! contrasted to the typical value the g because that Atlanta, which is 979.5 cm/s2, this value only deviates 0.05% indigenous the conventional value. Here we are reporting more than likely the ideal value we ever before got, however the values from this experiment room usually in between 960 and 1000 cm/s2, so it is a great freefall experiment.

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The bob is suspended native the spicy iron main point of an electromagnet in ~ the optimal of the sparking apparatus.
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On the insulating bob has actually been inserted a steel ring v a spicy edge. The fills most of the room between the former wire and the earlier wire positioned behind the waxed tape.


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The spicy edge concentrates the electrical field and makes it easier for a spark to run to the ring and from the ring to the back wire, passing through the tape to do the mark.
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