Q: Why a spider hanging from a thread does not rotate?

• mistyblue

  12 Apr 06, 00:57

  the silk solidify into whatever shape loh. therefore no spinning ?
• ndmmxiaomayi

  12 Apr 06, 01:00

  Originally posted by mistyblue:

  the silk solidify into whatever shape loh. therefore no spinning ?

  Correct, but not solidify. Though there are liquid involve, it has got to with the material of the thread.
  
  
  
  Answer: Compare a copper thread and spider thread. A copper thread oscillates slightly but does not return to its original shape, and becomes more fragile as a result of these oscillations. Spider's thread, on the other hand, is very efficient at absorbing oscillations, regardless of air resistance, and retains its twisting properties during the experiments. It also returns to its exact original shape. Certain alloys, such as Nitinol, possess similar properties but must be heated to 90° to return to their original shape.
• hisoka

  12 Apr 06, 01:02

  Originally posted by ndmmxiaomayi:

  Correct!!!
  
  
  
  Answer: Compare a copper thread and spider thread. A copper thread oscillates slightly but does not return to its original shape, and becomes more fragile as a result of these oscillations. Spider's thread, on the other hand, is very efficient at absorbing oscillations, regardless of air resistance, and retains its twisting properties during the experiments. It also returns to its exact original shape. Certain alloys, such as Nitinol, possess similar properties but must be heated to 90° to return to their original shape.

  i say got damping le you say not correct. absorb the oscillations mah.
• mistyblue

  12 Apr 06, 01:03

  NOW I CAN SLEEP!
• ndmmxiaomayi

  12 Apr 06, 01:05

  Originally posted by hisoka:

  i say got damping le you say not correct. absorb the oscillations mah.

  My physics is cmi one, paiseh. I don't know damping.
• mistyblue

  12 Apr 06, 01:06

  actually watch documentary ... but I was not paying full attention...
• hisoka

  12 Apr 06, 01:07

  Originally posted by ndmmxiaomayi:

  Damping is the same meh?

  damping is to damp the system so that oscillation will decrease with time mah. in heavy damping the oscillation finished in like 1 peroid.
  
  isn;t what you discribed damping via the characteristics of the web??
• ndmmxiaomayi

  12 Apr 06, 01:07

  Originally posted by mistyblue:

  actually watch documentary ... but I was not paying full attention...

  I see.
• ndmmxiaomayi

  12 Apr 06, 01:08

  Originally posted by hisoka:

  damping is to damp the system so that oscillation will decrease with time mah. in heavy damping the oscillation finished in like 1 peroid.
  
  isn;t what you discribed damping via the characteristics of the web??

  The damping I learn in school different leh.
  
  Got to do with weight also, but not this. Can't remember liao..
• hisoka

  12 Apr 06, 01:09

  Originally posted by ndmmxiaomayi:

  The damping I learn in school different leh.
  
  Got to do with weight also, but not this. Can't remember liao..

  damping alot of methods
• ndmmxiaomayi

  12 Apr 06, 01:10

  Originally posted by hisoka:

  damping alot of methods

  Orh. We only learnt one.