Pendulum investigation
A second look at your readings. Every measurement stays yours.
Your readings 5
| Trial | Length L | Time s | Period T / s | Remove |
|---|
Length: pivot to the centre of the bob. Time: 10 complete back-and-forth swings.
See the relationship
All valid readings included.
What deserves a second look?
Behind the investigationThe physics, the checks, and their limits
The small-angle model
For a simple pendulum, T = t / N and T² = 4π²L / g. Length is converted to metres and elapsed time to seconds. The blue reference uses g = 9.81 m/s², an approximate Earth value.
Use a small release angle (under about 15°), a light string, and a compact bob. Measure from the pivot to the bob’s centre.
Clues, not conclusions
With at least four readings and a consistent majority, checks use the median T²/L. Otherwise, they compare against the Earth model. Timing differences above 15% are flagged for review.
A unit hypothesis appears only for an extreme mismatch (over 10× in T²/L) that one alternative length unit brings within 15% of the trend. A timing or cycle-count mistake could also explain it.
Your measurements stay yours
Previews change only the graph and fitted estimates. They never edit the input table. Change an entry yourself only after checking your notebook or repeating the experiment.
The fit is ordinary least squares with a free intercept, using every valid displayed reading. These checks are not uncertainty estimates or proof of a mistake. Readings are session-only; reloading resets them.