3.2弹力2(国外英文资料).doc

3.2弹力2(国外英文资料) 3.2 stretch 2 Teaching goal: A goal of knowledge What is the condition of the spring and the spring Knowing the force, the force, the pull of the rope is the elastic force that can be drawn correctly in the diagram of the force Their direction. Knowing that the larger the size of the spring, the greater the spring force, the length of the spring is proportional to the length of the spring elongation (or shortening) Second, ability objective: Train the students to determine the direction of the elasticity in the actual problem Moral education objective: In the experiment, the observation ability is cultivated and the practical spirit of realism is combined. Teaching important points: The condition of the spring force, the direction of the elasticity Teaching difficult points: Whether there is elasticity between the objects in contact The determination of the direction of elasticity Teaching methods: Demonstrate and discuss questions Teaching AIDS: Spring, sponge, thin bamboo slice, small deformation demonstrator Scheduling: 1 hours Teaching steps: Import new lessons When you jump out of the sports field you need to use a stepping board, and the pole of the pole vaulting the pole, youre using the elasticity of their elastic deformation, Students can also point out a lot of the use of resilience, who? Students answer archery archery, jump bed, diving board ... How does that spring force come about? Second, new course teaching (1) the purpose of this lesson is to be shown in a movie Know the concept of deformation The ability to understand elasticity is caused by the need to recover the original form, and to the object that is in contact with it You can judge the direction of the spring Know the type of deformation (2) learning the goal completion process How does the spring force come from? (1) experimental demonstration: Compress the spring, sponge, and bend the bamboo with your hands What are the observations? Student: see the shape or volume change T