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在高中教学中,重力这个概念,对学生而言是个不可能一步到位、讲得清道得明的概念.例如:重力与万有引力的区别和联系,重力的大小和方向,重力的作用等等.下面就重力的一点认识梳理如下,以期与大家共勉.1.重力不是万有引力同学们都知道,地球在不停自转,物体需要有维持追随地球自转的向心力,而这一向心力需要由地球给物体的万有引力来提供.如图1所示,根据平行四边形定则可知,向心力和重力分别是万有引力的一个分力,重力不是万有引力.
In high school teaching, the concept of gravity, which is impossible for students to put in place, speaks clearly of the concept of clear ascension, such as the distinction and connection between gravity and gravitation, the magnitude and direction of gravity, the role of gravity, etc. Below Grasp the following understanding of gravity, with a view to mutual encouragement.1.Gravity is not gravity Everyone knows that the Earth is constantly rotating, the object needs to maintain a centripetal force to follow the rotation of the Earth, and this centripetal force by the Earth’s gravitation to the object As shown in Figure 1, according to the parallelogram we know that centripetal force and gravity are respectively a component of gravitation and gravity is not gravitation.