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两个相互接触的粗糙物体,由于外界作用而有相对运动趋势时,将产生反抗相对运动的静摩擦力作用。在通常情况下,当驱动力超过某一临界值时,物体间将发生相对滑动,变静摩擦力为滑动摩擦力。然而在某些条件下,即使驱动力无限增大,物体间也不会发生相对滑动,这种现象称之为自锁现象。一般物理读物中只分析最简单的劈的自锁问题,其实自锁现象在日常生活中是很普遍的,了解自锁现象及其条件是具有实际意义的。本文将通过实例就常见的自锁现象作一分析。 1 质点的自锁劈的自锁是最简单也是最典型的质点自锁现象。
When two rough objects in contact with each other have a tendency of relative movement due to external influences, static friction acting against relative motion will occur. Under normal circumstances, when the driving force exceeds a certain critical value, relative sliding occurs between objects, and the static friction force is sliding friction force. However, under certain conditions, even if the driving force increases indefinitely, relative sliding between objects does not occur. This phenomenon is called self-locking. In the general physical reading, only the simplest self-locking problem is analyzed. In fact, self-locking phenomenon is very common in daily life. It is of practical significance to understand the self-locking phenomenon and its conditions. This article will use an example to analyze the common self-locking phenomenon. 1 The self-locking of the particle is the simplest and most typical particle self-locking phenomenon.