10.2浮力的大小2（10.2 the size of the buoyancy force 2）.doc

10.2浮力的大小2（10.2 the size of the buoyancy force 2） The eleventh chapter fluid force phenomenon second section buoyancy size (this section is completed in 2 hours) Teaching target: 1, knowledge and skills To know the size of buoyancy and what factors. Know the Archimedes principle. We will calculate the size of buoyancy. 2, process and method: The students through the experiment, explore the size of buoyancy and what factors, training hypothesis, the experimental design ability of the students scientific inquiry ability. The students have organized the experiment steps. 3, emotion, attitude and values: The understanding through the study of the development of science and technology affects society. Through experimental research, cultivate students respect for science, scientific attitude. Teaching emphasis: The Archimedes principle. Teaching difficulties: On the understanding of the displaced fluid. Teaching aids: a water glass, glass cylinder, the same volume of iron, copper, iron, large table tennis, a small plastic bag instructional design Experiment study: what is the size of buoyancy? (1) lead guess: what do you think the size of buoyancy is related to? The students guess: and immersed in liquid in depth, and the shape of the object, object and density, and the volume of the object, object and quality related, and immersed in the liquid volume, and the density of the liquid is closed and so on. (2) emphasis is placed on the method of controlling variables: In the study of a physical quantity with another physical quantity, we often use the variable control method, that is to say we have to study the relationship of buoyancy and object immersion depth in the liquid now, so we must control the same other experimental conditions, we use the same object in the same the liquid, then we can study the floating The relation between force and the depth of an object immersed in a liquid. If the buoyancy does not change at different depths, what does that mean? That is, buo