论文部分内容阅读
在力学中,常常涉及“轻弹簧”、“轻绳”问题.所谓“轻”是指其质量可以忽略,所受重力可以不记,是一种理想状态,是为了使问题简单化而进行的一种科学设想.轻弹簧和轻绳有很多共同点,如它们都能提供拉力,并且拉力方向都沿着绳或弹簧的方向.在这里,我们重点看看它们的区别:(1)轻绳只能提供拉力,而轻弹簧既可以提供拉力,又可以提供支持力.(2)在力的突变问题上有显著的区别,轻绳是一种不发生明显形变就能产生弹力的物体,在处理瞬时问题时,认为弹力瞬间发生变化,不需要考虑形变恢复时间;而轻弹簧的特点是形变量大,形变恢复需要时间,在处理瞬时问题时,其弹力在瞬间是不变的,随后逐渐
In mechanics, the problem of “light spring ”, “light rope ” is often involved.The so-called “light ” means that its quality can be neglected, the gravity can not be recorded, it is an ideal state, A scientific assumption that simplifies the problem.The light spring and the light rope have many things in common, such as they can provide the pulling force, and the pulling force is in the direction of the rope or spring.Here, we will focus on their differences : (1) The light rope can only provide the pulling force, while the light spring can provide both the pulling force and the supporting force. (2) There is a significant difference in the sudden change of force. The light rope is a kind of light rope Elastic objects, when dealing with the transient problem, think that the elastic force changes instantaneously and does not need to consider the time of deformation recovery. The characteristics of the light spring are that the deformation amount is large and the deformation takes a long time. When dealing with the transient problem, its elastic force is instantaneous Unchanged, then gradually