How does Walter Lewin draw dotted lines so quickly on a blackboard?

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Discussion Overview

The discussion revolves around the techniques used by Walter Lewin to draw dotted lines quickly on a blackboard during his lectures. Participants explore various aspects of this skill, including the physical mechanics and potential techniques involved in free-hand drawing with chalk.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether Lewin's speed is due to a fast muscle-twitch or a special technique.
  • Another participant suggests that the chalk skipping on the chalkboard may contribute to the speed and effectiveness of drawing.
  • A participant notes that chalk creates more friction against a chalkboard compared to a marker on a whiteboard, which aids in control while writing.
  • There is a suggestion to experiment with the angle of the chalk to achieve similar effects as Lewin.
  • One participant offers a tip for drawing circles, indicating that the order of drawing the circle and its center affects centering accuracy.
  • Another participant emphasizes the importance of the angle and pressure applied when holding the chalk for drawing.
  • A participant expresses confusion about necroposts, indicating a side discussion unrelated to the main topic.

Areas of Agreement / Disagreement

Participants express various hypotheses regarding the techniques and mechanics of drawing quickly with chalk, but no consensus is reached on a definitive explanation or method.

Contextual Notes

Some participants reference personal experiences and observations, which may not be universally applicable. The discussion includes subjective views on the effectiveness of different writing surfaces and techniques.

Who May Find This Useful

Individuals interested in teaching techniques, chalkboard usage, or those who admire Walter Lewin's lecture style may find this discussion relevant.

FeDeX_LaTeX
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Hello,

I have been watching a few lectures recently by Walter Lewin at MIT, and I've noticed that he draws dotted lines really quickly using only a piece of chalk and his hand. How does he do this free-hand so quickly? Does he just have a very fast muscle-twitch or is there a special technique of doing this? I have tried doing this on my whiteboard at home and I can't do it anything like the speed at which he does it.
 
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FeDeX_LaTeX said:
Hello,

I have been watching a few lectures recently by Walter Lewin at MIT, and I've noticed that he draws dotted lines really quickly using only a piece of chalk and his hand. How does he do this free-hand so quickly? Does he just have a very fast muscle-twitch or is there a special technique of doing this? I have tried doing this on my whiteboard at home and I can't do it anything like the speed at which he does it.
Is it the same Walter Lewin as this one?
https://www.physicsforums.com/showthread.php?t=464025&highlight=lewin"
 
Last edited by a moderator:
It's got to be the chalk skipping on the chalkboard. I once knew a guy that could draw practically perfect concentric circles free-hand. It was the most amazing thing I'd ever seen.
 
Chalk makes more friction against a chalkboard than a marker makes against a whiteboard. That friction is a useful tool for helping me "control" my writing. My writing during lectures became noticeably sloppier when we replaced our chalkboards with whiteboards.
 
Hello,

Thank you for the link. That is exactly what I was talking about. I would really like to try and see if I can figure out how to angle the chalk to produce that effect on a blackboard. Regarding the drawing of perfect circles, I also think this is very cool. I guess this is because the shoulder is a ball-and-socket joint.
 
Tip for drawing circles on the board (whether white or chalk): First draw the circle, then draw the dot for its center. It's a lot harder to center them properly when you do it the other way!
 
FeDeX_LaTeX said:
I would really like to try and see if I can figure out how to angle the chalk to produce that effect on a blackboard. Regarding the drawing of perfect circles, I also think this is very cool. I guess this is because the shoulder is a ball-and-socket joint.

This guy demonstrates it very nicely. It's all about the angle at which you hold the chalk and the pressure you apply.
 
Last edited by a moderator:
Necroposts mystify me.
 

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