機械制造專業英語課后翻譯答案稱作力學，力學由兩大部分組成，靜力學和動力學。
For example, if the force operating on a sleeve bearing becomes too high, it will squeeze out the oil film and cause metal-to-metal contact, overheating and rapid failure of the bearing.例如：如果止推軸承上的作用力過大的話，會擠出油膜，引起金屬和金屬之間的相互接觸，軸承將過熱而迅速失效。
Our intuitive concept of force includes such ideas as place of application, direction, and magnitude, and these are called the characteristics of a force.力的直觀概念包括力的作用點、大小、方向，這些被稱為力的三要素。
All bodies are either elastic or plastic and will be deformed if acted upon by forces. When the deformation of such bodies is small, they are frequently assumed to be rigid, i.e., incapable of deformation, in order to simplify the analysis.所有的物體既可以是彈性的也可以是塑性的，如果受到力的作用就產生變形。當變形很小的時候它們被假設成剛體，也就是不產生變形。
The rigid-body assumption cannot be used in internal stresses and strains due to the applied forces to be analyzed. Thus we consider the body to be capable of deforming.剛體...
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