A phenomena i cant fully understnad

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In summary, the conversation discusses the behavior of a rotating screw at different speeds. It is observed that at low speeds, the screw stops after a few seconds, but at a high initial speed, it rotates, stops, and then rotates backwards before stopping again. The reason for this is believed to be the drag force, which has two components - one for low speeds and one for high speeds. However, the exact explanation is unclear and the person hopes for someone to provide an answer. Other potential factors such as the screw twisting due to torque or a strobe lighting effect are also mentioned. The comparison to a rattleback toy is also brought up, but it is acknowledged that this explanation may not apply to a regular screw. The conversation ends
  • #1
alexay95
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when i rotate a screw at low speed he stop after sec.
but when giving him high initial speed he rotate,stop,and rotate backwards and stop again.
i think its because the drag force which got 2 components,1 take care of low speed velocities and the other high speed.
i'm not fully understand that,and i hope someone can answer me.

*sry for my bad english,lol
 
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  • #2
Where do you rotate the screw?
The fast rotation might lead to something like a compressed (or extended) spring, which reverses the direction to extend (or compress) again afterwards.
 
  • #4
Is it a very long screw? Then driving long screws into hardwood I've seen the screw twist due to the high torque. Then when you stop the twist unwinds. It is most noticible on long screws that only have a thread at the pointed end like these...

http://www.screwfix.com/p/timberfix-plus-exterior-timber-screws-6-3-x-200mm-pk50/36687

Could also be a strobe lighting effect?
 
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  • #5
0xDEADBEEF said:
Does it look like this? http://en.wikipedia.org/wiki/Rattleback

yes,but on an ordinery screw

http://0.tqn.com/d/homerenovations/1/0/A/A/-/-/1-5-8-Coarse-Drywall-Screw.jpg

about spring similarity,why would a hard screw act like 1?
 
  • #6
If it is really just a screw I don't think the rattleback explanation works. What is probably happening, is that the screw can roll up on its thread at the tip a bit, when it is spun fast enough. When it comes to a rest it rolls back so the thread at the tip points up again. But if you don't think that is the reason, maybe you should make a video.
 

FAQ: A phenomena i cant fully understnad

What is the cause of this phenomenon?

The cause of a phenomenon can vary and is often complex. It may be due to natural forces, human activities, or a combination of both. More research and data may be needed to determine the exact cause.

How does this phenomenon affect our daily lives?

This depends on the specific phenomenon and its impacts. Some phenomena may have a direct impact on our daily lives, such as weather events, while others may have more indirect effects, such as changes in the environment or economy.

Can this phenomenon be predicted or controlled?

In some cases, yes, a phenomenon can be predicted or controlled to some extent. For example, weather patterns can be forecasted using advanced technology and knowledge of atmospheric conditions. However, some phenomena may be more difficult to predict or control, especially if they are influenced by multiple factors.

How do scientists study and understand this phenomenon?

Scientists use a variety of methods to study and understand a phenomenon, including observation, experimentation, and data analysis. They may also use models and simulations to better understand the complex processes involved.

Will this phenomenon continue or change in the future?

This is difficult to predict with certainty, as it depends on many factors and can vary greatly. Scientists can make educated guesses based on current data and trends, but future changes may also be influenced by unforeseen events or human actions.

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