Junior high school physics lever collective lesson preparation suggestions and measures lesson plan and reflectionThe following is a suggestion and measures for collective lesson preparation for junior high school physics leverage:
** 1. Teaching plan **
#(I) Teaching objectives
1. ** Knowledge and Skill Target **
- The student can accurately state the definition of a lever and the five elements (pivot, power, resistance, power arm, and resistance arm).
- Understand the equilibrium condition of the lever (F1×L1 = F2×L2) and be able to use this condition to solve simple calculation problems.
- Able to differentiate between effort-saving lever, effort-consuming lever, and equal-arm lever, and list examples in life.
2. ** Course, Method, and Target **
- Through experiments, the equilibrium conditions of the lever were explored, and the students 'experimental operation ability, data collection and analysis ability were cultivated.
- In the process of analyzing leverage examples in life, students 'observation, induction, and logical thinking skills will be improved.
3. ** Emotions, attitudes, values, goals **
- To stimulate the students 'interest in physics and let them experience the close connection between physics and life.
- Cultivate students 'rigorous scientific attitude and teamwork spirit.
#(II) Difficulties in Teaching
1. ** Teaching Focus **
- Exploration and understanding of the five elements of leverage and the conditions for leverage equilibrium.
- Judgment of effort-saving lever, effort-consuming lever, and equal-arm lever.
2. ** Teaching Difficulties **
- The concept and drawing of the arm of force.
- Using leverage to solve practical problems.
#(3) Teaching Method
Teaching method, experimental inquiry method, discussion method, case analysis method
#(IV) Teaching process
1. ** import (5 minutes)**
- Show the students the real examples of leverage, such as scissors, seesaw, bottle opener, etc. Ask the students what the common features of these tools are when they work. Guide the students to think and draw out the concept of leverage.
2. ** New lesson (25 minutes)**
- The definition of leverage and its five elements
- Explain the definition of a lever: a hard rod that can rotate around a fixed point under the effect of force. It emphasized that the "hard stick" did not have to be straight. It could be a curved object as long as it met the definition conditions.
- Explain the five elements of the lever in detail: the pivot (the fixed point around which the lever turns), the power (the force that makes the lever turn), the resistance (the force that hinders the lever from turning), the power arm (the distance from the pivot to the line of action of the power), and the resistance arm (the distance from the pivot to the line of action of the resistance). By drawing on the blackboard and demonstrating with real objects (such as using a simple lever model), the students could intuitively understand the five elements.
- The condition of equilibrium of the lever
- Ask the question: Under what circumstances will the lever balance? He guided the students to make guesses.
- Experimental Exploration:
- It introduced the experimental equipment, such as the lever with scale, hook code, support, etc.
- Demonstrate the operation steps of the experiment: First, adjust the nuts on both ends of the lever so that the lever remains horizontal and still (balanced state) when it is not hooked. Then, hang different numbers of hooks on both sides of the lever, and balance the lever in the horizontal position again by changing the position of the hooks (that is, changing the arm of force). Record the data of the power arm, power arm, resistance arm, and resistance arm in each experiment.
- Students were organized into groups to carry out experiments. Teachers patrolled and guided the students to remind them of the safety of the experiment and the accuracy of the data.
- At the end of the experiment, the students were guided to analyze the experimental data and discover the law of power x power arm = resistance x resistance arm, thus obtaining the equilibrium condition of the lever.
- The classification of leverage
- According to the equilibrium conditions of the lever (the relationship between L1 and L2, F1 and F2), three types of lever were introduced:
- Equal arm lever (when L1 = L2, F1 = F2), such as a balance, giving examples of its working principle and characteristics.
- The effort-saving lever (when L1>L2, F1<F2), such as a bottle opener, analyzed the reason for its effort-saving and its application scenarios.
- The laborious lever (when L1<L2, F1>F2), such as tweezers, explains why the laborious lever is used and its advantages (distance saving).
3. ** Class practice (10 minutes)**
- He gave some basic exercises about the lever, such as determining the type of lever, calculating the length of the arm of force, and solving the force according to the equilibrium conditions of the lever. The students were allowed to complete it independently in class, and then the students at the same table would mark each other. The teacher would focus on explaining the problems that the students had.
4. ** Class summary (5 minutes)**
- Guide the students to review what they have learned in this lesson, including the definition of leverage, the five elements, equilibrium conditions, and classification. Ask the students to answer the main points of each knowledge point. The teacher will supplement and improve them.
#(5) Teaching Resources
Scaled lever, hook code, stand, scissors, bottle opener, tweezers, and other physical objects, multi-media equipment (used to display pictures and experimental videos)
** II. Suggestion and measures **
#(I) Before preparing for class
1. The members of the teacher team each studied the contents of the teaching materials in depth, clarified the teaching objectives, important and difficult points, consulted relevant materials (such as physics teaching reference books, academic papers, etc.), and collected more examples of leverage, experimental expansion content, etc. in order to enrich the teaching content.
2. To understand the students 'prerequisite knowledge level, such as through pre-test, homework feedback, etc., to grasp the students' understanding of the concept of force, the balance of two forces, and other related knowledge, so as to better connect the knowledge in teaching.
#(II) Preparing for lessons
1. Experimental design
- For the experiment of the lever balance condition, the experimental steps must be carefully designed to ensure the maneuverability and accuracy of the experiment. For example, when choosing a lever, factors such as the length of the lever and the clarity of the scale should be considered; when hooking the code, students should be reminded to pay attention to the quality standard and hanging method of the hook code to avoid experimental errors.
- He could design some comparison experiments or expansion experiments, such as changing the shape of the lever (straight and curved) to explore whether the equilibrium conditions of the lever had changed, so as to deepen the students 'understanding of the concept of lever.
2. teaching method choice
- It adopted a combination of various teaching methods. When explaining abstract concepts (such as the arm of force), visual teaching methods such as physical demonstration and animation demonstration could be used to let students understand better; When exploring the equilibrium conditions of the lever, the experimental inquiry method was mainly used to let students discover the rules in their independent inquiry; When analyzing the classification of the lever, the discussion method was used to guide students to discuss in connection with the actual life and improve the participation of students.
3. teaching resources integration
- In addition to the common leverage examples mentioned in the teaching materials, they could also collect some special leverage objects, such as the leverage in the human body (such as the skeletal muscle structure of the arm). They could be displayed in class or observed by students in groups to stimulate their interest in learning.
- Using multi-media resources to create exquisite teaching coursewares, including clear lever structure diagrams, experimental operation videos, and videos of lever applications in life, etc., to assist the teaching process.
#(3) After preparing for class
1. He would conduct a trial lecture and invite other teachers to listen and give their opinions. In the process of the trial lecture, pay attention to the students 'reactions and record the difficulties and problems that the students encountered when understanding the knowledge points so that they can further modify the lesson plan.
2. According to the feedback from the trial lecture and the suggestions of other teachers, the teaching content, teaching methods, and time allocation in the teaching plan were adjusted. For example, if you found that a certain knowledge point was too long or too short, you could adjust it appropriately. If a certain teaching method was not effective, you could change it to another more suitable method.
** 3. Reflection **
#(I) Teaching Effect
1. In the teaching process, most students could actively participate in the experiment operation and draw the correct conclusion based on the experimental data. This shows that the experimental inquiry method can effectively stimulate students 'interest and initiative in learning, and improve students' experimental ability and scientific inquiry ability.
2. When explaining the classification of the lever, by listing a large number of examples in life and letting the students discuss and analyze, the students had a deeper understanding of the concept of the effort-saving lever, the effort-consuming lever, and the equal-arm lever, and could accurately judge the type of lever in life. However, there were still some students who had difficulty in judging some of the more complicated leverage structures (such as composite leverage structures). This might be because their understanding of the concept of the arm of force was not thorough enough and needed to be strengthened in future teaching.
#(2) Teaching Method
1. The combination of various teaching methods improved the teaching effect to a certain extent. For example, physical demonstration and animation played a very good role in explaining abstract concepts, making it easier for students to understand. However, in the classroom practice session, the traditional paper practice method lacked interaction and immediate feedback. In the future, he could consider introducing an online practice platform to allow students to practice in real time and get answers and analysis in time.
2. In the process of group cooperation experiments, it was found that some groups had individual students leading the experiment, and the participation of other students was not high. In the future, more detailed arrangements needed to be made in the division of labor in groups to ensure that every student could fully participate in the experiment.
#(3) Teaching Resources
1. The physical resources and multi-media resources used in teaching effectively enriched the teaching content and attracted the students 'attention. However, in terms of the production of the multi-media course, it could be further optimized. For example, some interaction elements could be added, such as clicking on different parts of the lever to display the five elements, so as to improve the learning experience of the students.
2. When collecting examples of leverage in life, although many common examples had been covered, some innovative examples that were closely related to student life could be further explored, such as new types of labor saving tools, to better reflect the close connection between physics and life.
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