Equilibrium and Stability

Equilibrium and Stability

所有跟贴·加跟贴·新语丝读书论坛

送交者: gyro 于 2009-11-03, 17:08:04:

回答: GYRO,这问题有点意思。由 JFF 于 2009-11-03, 13:10:24:

Without the line the kite will move upward and far away. But the motion must be unstable to tilting and rotation.

With the line the kite is in equilibrium and stable. The elasticity of the line is not essential.

I am just stating the obvious. You must be thinking about something else.

基本点上完全一致。 - JFF (868 bytes) 2009-11-03, 19:17:07 (380258)
- The stabilizing force of "elasticity" - gyro (288 bytes) 2009-11-03, 19:28:37 (380266)
  - 其它方向的stability 是另外两个东西来实现的。 - JFF (273 bytes) 2009-11-03, 20:31:16 (380293)
  - 完全同意。 - JFF (379 bytes) 2009-11-03, 19:55:25 (380274)
    - 同意风筝稳定的描述 - gyro (122 bytes) 2009-11-03, 20:55:59 (380311)
      - 风筝拉线问题可以定论了。谢谢。 (无内容) - JFF (0 bytes) 2009-11-03, 21:56:33 (380332)
      - 对，鼓风机向上吹球可以是稳定的。这个例子不好。 - JFF (168 bytes) 2009-11-03, 21:16:09 (380321)
        
        鼓风机向上吹，风力随高度递减，这跟弹簧一样。 - JFF (127 bytes) 2009-11-03, 21:54:03 (380331)
    - 想起更简单的： - JFF (128 bytes) 2009-11-03, 20:23:25 (380290)