# Stick-Slip with Chalk: Understanding the Physics

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• Sho Kano
In summary, the video demonstrates how a block can slip on a surface with just one stroke of chalk due to the difference between static and kinetic frictional forces, creating a "frictional impact oscillator." This phenomenon cannot be replicated on a dry erase board.
Sho Kano
What is the physics behind drawing dotted lines with chalk with just one stroke?
This is a video demonstrating this:

Here is what I currently have:

as soon as the applied force exceeds that of the frictional, the block will accelerate. What makes it slip though? Because there is a jerk (change in acceleration) due to the difference between static and kinetic frictional forces?

Sho Kano said:
<snip>What makes it slip though? Because there is a jerk (change in acceleration) due to the difference between static and kinetic frictional forces?

I don't think it's stick-slip behavior, it seems to be more complicated (a "frictional impact oscillator"):

http://www.mate.tue.nl/mate/pdfs/2323.pdf

Sho Kano and wrobel
can't do that on a dry erase board...just sayin'

## 1. What is stick-slip behavior and how does it relate to chalk?

Stick-slip behavior is a phenomenon in which two surfaces slide against each other in a series of jerky motions, rather than a smooth continuous motion. In the case of chalk, when writing on a chalkboard, the chalk sticks to the board and produces a squeaky sound as it moves. This is due to the stick-slip behavior of the chalk on the surface of the board.

## 2. What causes stick-slip behavior with chalk?

The specific cause of stick-slip behavior with chalk is the interplay between two types of friction: static friction and kinetic friction. When the chalk is at rest on the board, static friction holds it in place. But as the chalk moves, kinetic friction takes over and causes the jerky motion known as stick-slip behavior.

## 3. How does the texture of the chalk and the surface of the board affect stick-slip behavior?

The texture of the chalk and the surface of the board play a significant role in stick-slip behavior. A rougher surface or chalk with a rougher texture will create more resistance and result in a stronger stick-slip effect. Conversely, a smoother surface or chalk with a smoother texture will produce less resistance and result in a weaker stick-slip effect.

## 4. Are there any real-world applications of understanding stick-slip behavior with chalk?

Yes, understanding stick-slip behavior with chalk has several real-world applications. For example, engineers can use this knowledge to design more efficient braking systems for vehicles, as well as improve the grip of tires on different surfaces. Additionally, understanding stick-slip behavior can also help improve the performance of machines and tools that rely on friction for their operation.

## 5. Is there any ongoing research on stick-slip behavior with chalk?

Yes, there is ongoing research on stick-slip behavior with chalk and other materials. Scientists are studying the underlying physics behind this phenomenon and exploring ways to control and manipulate it for various applications. Additionally, there is ongoing research on developing new materials with optimized friction properties to reduce stick-slip behavior and improve overall performance.

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