Acceleration of Free Fall - Analysis of the Experiment
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- čas přidán 23. 11. 2021
- I've * finally * shot and edited this analysis video! 🤦♂️ 🥳
Analysis of the data collected for the experiment to determine the acceleration of free fall (often referred to acceleration of gravity or g).
There is a free worksheet to go with this experiment. I recommend that students try doing the analysis themselves - get as much practice as possible! Worksheet available here: www.tes.com/teaching-resource...
This method uses a light gate to measure the time taken for a weighted card to fall through a known height and then the light gate. The time is then used to calculate the mean final velocity of the card. This with the height obeys the relationship v² = u² + 2as (equation 4 of the equations of uniform acceleration, sometimes called suvat equations).
The data is plotted on a graph - v² against h. Then analysed to use the gradient to calculate a value for g. The data was collected in video 1 ( • Acceleration of free f... ).
The spreadsheet I use in this video is available here: www.tes.com/teaching-resource...
Measuring accleration of free fall is a mandatory practical for many physics specifications. So this is good practice for OCR physics A, AQA A-Level physics, Edexcel A-Level physics, CPAC, PAG, practical endorsement.
Relevant concepts: acceleration, free fall, motion, measurements, light gate, electronic timer.
Thank you so much for this video. It has been really helpful, and you explain wonderfully! I had a couple o questions, though. Are we measuring the height fro the midpoint of the card or from the top, and what is more accurate? Also, why dies this graph not go through the origin??
Hi. I’m glad you found it helpful.
We measure to the midpoint of the card. The card breaks the light beam whilst it moves through the beam. So we take the point that corresponds with the average velocity of the card through the beam which is the midpoint. If we measure to the top of the card in the beam the card would be moving faster than it’s average speed through the beam.
The graph does not go through the origin due to the errors / limitations of the experiment. E.G. there is air resistance which was neglected.
@@PhysicsHQ thank you!
hello, how can I make a simple device that can see 1 meter below the ground. thanks.