在日常生活中人们从事着各种各样的劳动,如推车、搬运重物、举起重物等。在这些劳动中会有两种不同的力学现象,用力推车,车被推动了或车没推动。用力搬石块,石块被搬起或石块没搬动。在这两种现象中,人们都用了力,可以说都在劳动。但从效果上讲,劳动是有区别的,为此引入了“功? In daily life, people are engaged in various kinds of labor such as carts, carrying heavy objects, and lifting heavy objects. There are two different mechanical phenomena in these labors. With a hard cart, the car is pushed or the car is not pushed. Efforts were made to remove stones and the stones were lifted or the stones were not moved. In both of these phenomena, people have used their power and it can be said that they are all working. However, in terms of effect, there is a difference in labor. To this end, it has introduced “work?”