Irony is when a video from 2012 helps you more than your useless college. Thanks a lot.

I was thinking on how to introduce the subject, this could not have been a better way! Many thanks

This is how uncertainty propagates in an 'absolute tolerance system', rather than a 'statistical tolerance system'.

This video Helped me a lot! Thank You Sir! IB student from France :)

Very educative video ...helped me alot for 10 th board....FROM INDIA

4:06 he does magic

Professor, thank you for great explain, would you give a brief calculation for propagation of error for multistage

Dude is a freaking magician! 13:59

There's something missing (for me) in this explanation. That is, how is the uncertainty, characterized? Most elementary treatments of this topic treat uncertainty a random and normally distributed variable. In that case, you would not use these formulas.

No reasoning is given for considering the uncertainty as +/- 0.7 cm for the case of the half = 10 cm. The +/- 0.7 cm is not intuitive, and seems lacking logic. There is something behind which is not said. What about working on 1 cm, or even 0.1 cm, instead of 20 cm, will its uncertainty be considered in both cases as +/- 0.7 cm. Is "adding" uncertainty to become +/- 0.7 cm logic?. Where is the "general role" that everybody may apply? This adds "ambiguity" to the whole issue rather than removing it as assumed. No one can accept uncertainty of +/- 0.7 cm on a piece of 1 cm in length , for not to talk about the uncertainty of +/- 0.7 cm on a piece of 0.1 cm in length, otherwise we are in a world of "science fiction" rather than in a real "physical world". Roles, whatever they are, cannot drop the "simple intuitive logic". What does "this uncertainty" mean after all this strange story?

is this error propagation?

I think his chalk is just breaking in half

Width and height? These are not the width and the height, these are the length and the width of the wood plate.