A Level Physics: Uncertainty and graphs, line of worst fit

If you have found this video useful, a like and a sub would only be fitting! : )

Revising A Level Physics? Check out my revision videos too:
How can we find the percentage uncertainty of a gradient of a graph using error bars?

Music Credit: Anodised from Microsoft Video Editor

Chapters:
00:00 Line of Best Fit
01:02 Line of Worst Fit
02:50 Uncertainty in the gradient

[sacitkral]

very good explanation. this video was very useful for me :) thank you

[higaddrip]

Is there another potential line of worst fit by using the error bars for the x-axis values?

Would you just look to see which line would be worse when choosing between y-axis error bars and x-axis error bars?

Good video anyways!

[tjveyd]

Can we use a dashed line for the worst fit or is it better to use a solid line for worst fit?

[mohameddahir]

Im doing AQA instead of OCR however what i learn was that the best line of fit passes from the top of the bottem bar to the bottem of the top bar.

[superspike]

Whats an error bar? Ive never heard of this in cccea spec

[sportmaster]

Sir, for a list of data for percentage uncertainty you do +- half range / mean, multiplied by 100, but for a graph you don't half it. Why is there a difference ?

[khalidelra]

Is the absolute uncertainty the difference between the two gradients then? I was doing a past paper today and it asked me to include the absolute uncertainty from the gradient but I was unsure.

[EvanJanson]

Sir shouldn't the formula be like - percentage uncertainty in the gradient = (worst fit gradient - best fit gradient) / best fit gradient * 100, instead of (best fit gradient - worst fit gradient) which would return a negative value

[emedorodeborah]

The graph of my worse fit is always at the top of best fit, on subtracting it gives me a negative sign which I think is wrong. Can I subtract the value of worse fit from best fit

[pranavsiddappa]

are the lines of worst fit not supposed to go through the origin for this data?

[wofwa]

how big ie cm should each error bar be?