...In the above example, it is possible for the object to leave the surface or for the pendulum string to sag, so strictly speaking it is a constrained motion limited to one side of the surface, but such cases are also included in the broader definition of constrained motion. Constraints are thought to occur due to resistance and tension exerted by the surface and the string in an attempt to maintain the shape of the surface and the length of the string, and these forces are called constraining forces. Constraining forces are forces that appear just as needed, and it is not given in advance where and what kind of force will occur. ... *Some terminology explanations that mention "constraining force" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…上記の例では,物体が面を離れたり,振子の糸がたるむことは可能であるから,正しくいえば面の片側の領域に限られた束縛運動であるが,そういう場合も広い意味で束縛運動に含める。束縛は,面の形や糸の長さを保持しようとして,面や糸が及ぼす抗力や張力などによって起こると考えられ,これらの力を束縛力constraining forceという。束縛力はちょうど必要なだけ現れる力であって,あらかじめどこではどんな力が生ずるか与えられているわけではない。… ※「constraining force」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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