The physics teaching design plan is formulated to enable physics teachers to teach better. The following is a physics teaching design plan template. Welcome to read! Physics teaching design plan template 1
Teaching objectives
Knowledge and Skills
1. Understand that light can be reflected on the surface of some objects.
2. Understand the rules of light reflection and understand the meaning of normal, incident angle and reflection angle.
3. Understand the reversibility of light path in reflection phenomenon.
4. Understand what specular reflection is and what diffuse reflection is.
Process and Method
1. Observe the reflection phenomenon of light through experiments.
2. Experience and understand how we cannot see non-luminous objects.
3. Experience and explore the "laws of light reflection", use experimental methods to obtain the relationship between reflected light, incident light and normal position, measure the angle between reflected light and normal, incident light and normal Corner, summarize the conclusions of the inquiry, and gain a more comprehensive experience in inquiry activities.
4. Through observation, understand the main differences between specular reflection and diffuse reflection.
Emotional attitudes and values ??1. Cultivate students' scientific attitude in the process of exploring "the laws of light reflection".
2. Closely connect with reality and raise awareness of the application of science and technology in daily life and society.
3. Encourage students to actively participate in inquiry activities.
Important and difficult points in teaching
Teaching focuses on the reflection laws of light; specular reflection and diffuse reflection.
Teaching difficulties specular reflection and diffuse reflection.
Teaching tools
Laser source, plane mirror, paper, angle measurer
Teaching process
1. Review questions
Please give an example of using light to propagate along a straight line in the same substance.
2. Introduction of new lessons
Teacher: In the dark night, we can’t see the table and TV in the room. How can we see it?
We can see the sun and electric lights because they emit light and the light enters our eyes. Why can we see objects such as people, classrooms, and books that do not emit light themselves? This is because they can reflect light from light sources such as the sun and electric lamps, and this reflected light enters our eyes. In this section we will study the reflection of light and its laws.
III. New Course Teaching
1. Laws of Light Reflection
1. Teacher: Light changes direction when it reaches the interface between two different substances. , and the phenomenon of returning to the original substance is called reflection of light.
Demonstration 1: Use a plane mirror to reflect sunlight.
Observation: light spots on the wall and their changes.
Demonstration 2: Use a laser to demonstrate the reflection of light. Let students observe the incident light, reflected light, and point of incidence. And draw a picture on the blackboard:
The teacher introduces the following terms to the students: one point, two angles, three lines.
Incidence point (O): the point where light hits the mirror.
Normal (ON): a straight line (represented by a dotted line) passing through the incident point and perpendicular to the mirror surface.
Angle of incidence (i): The angle between the incident light ray and the normal.
Reflection angle (r): the angle between the reflected light and the normal.
2. Explore: the law of light reflection
Teacher: Observe the phenomenon of light reflection through demonstration. So what rules does light follow when it is reflected?
Experiment 1:
1. According to the textbook figure 2.2-3, let the light emitted from the laser incident along the cardboard to point O on the mirror surface , observe the position of the reflected light. Draw the positions of the normal, incident ray, and reflected ray on a white paper. Use a protractor to measure the angle of incidence and angle of reflection and record them.
2. Do not change the position of the incident point, change the position of the incident light, and repeat the above experiment twice.
3. If you fold half of the cardboard forward or backward, can you still see the reflected light?
Guide students to analyze the experimental phenomena and data and draw the following conclusions:
< p>①The reflected light, the incident light and the normal are on the same plane.②The reflected light and incident light are separated on both sides of the normal.
③The reflection angle is equal to the incident angle.
Writing on the blackboard: Law of reflection of light: The reflected light, the incident light and the normal are on the same plane, the reflected light and the incident light are separated on both sides of the normal, and the reflection angle is equal to the incident angle.
Experiment 2:
Direct the incident light to the mirror along the position of the original reflected light. Observe the location of the reflected light.
From the discussion, the light path is reversible in the reflection phenomenon.
3. Describe how to draw the reflected light path diagram:
Example: In the figure below, the incident light is known, please draw the reflected light.
Drawing method: ① draw the normal line through the incident point; ② draw the reflected ray (according to the reflection angle equal to the incident angle).
Student exercise: projector film.
(1) Draw the incident ray in the figure below.
(2) As shown in the figure, draw the reflected light and answer: What is the incident angle? What is the angle between the incident light and the reflected light?
Junior high school physics light reflection lesson plan
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2. Specular reflection and diffuse reflection
Demonstration 3: Use mirrors and white paper to reflect sunlight or light.
Question: Why is the light reflected by the mirror so strong but the light reflected by the white paper so weak?
Let’s study these two situations.
Teacher: The situation when parallel light is incident on the surface of a smooth object is as shown in the figure:
Junior middle school physics light reflection lesson plan
Guide students to analyze the mirror surface Reflection: Every ray of light obeys the laws of reflection. The reflected light is emitted in the same direction, and the reflected light in this direction is very strong, while there is no reflected light in other directions.
Demonstration 4: Insert a few pins vertically into the cardboard strips to represent the "normal lines". After bending the cardboard strips arbitrarily, the "normal lines" are no longer parallel. (Picture above)
Emphasis: Diffuse reflection also obeys the law of reflection.
Diffuse reflection reflects light in all directions, so we can see objects from all directions.
Teacher analysis example: Students cannot see the words on the reflective part of the blackboard. This is because the reflective part on the blackboard undergoes specular reflection, and the light intensity is stronger than the light diffusely reflected by the chalk characters. How to avoid this situation? Make the "reflective" part rough, so that diffuse reflection can occur and weaken the reflected light from the reflective part. Students can see the light reflected from the chalk characters clearly from different directions, that is, they can see the characters clearly. .
? Physics teaching design plan template 2
Learning objectives
1. Understand what internal energy is
2. Know the relationship between internal energy and The relationship between temperatures
3. Master the two ways of changing internal energy and use them to solve simple problems.
Learning focus: Internal energy and methods to change internal energy.
Learning difficulties: Work and heat transfer are equivalent in changing the internal energy of an object.
Preview test
1. It is called the internal energy of an object; the unit of internal energy is: .
2. As the temperature of the same object increases, the internal energy will be .
3. Although the temperatures of molten iron and ice are different, they both have .
4. The ways to change internal energy are: and .
5. Rubbing your hands in winter will make your hands warm by changing the internal energy; blowing your mouth into your hands to keep warm in winter is done by changing the internal energy.
6. A bullet flying at high altitude has _______ energy, _______ energy, and also _______ energy. After the bullet lands, the three energies that are not zero are ____
2016 Ninth Grade Physics Lesson Plan People's Education Edition
___ can.
7. The intensity of the irregular movement of a large number of molecules in an object is related to _______. When When the temperature of an object increases, its internal energy _______; when the temperature decreases, the internal energy _______
8. When an object does work on the outside, its internal energy _______, and its temperature _______; when the outside world When work is done on an object, the internal energy of the object _______ and the temperature _______. When pumping air on a bicycle, the cylinder wall will generate heat. This is because the air in the cylinder is compressed _______, which increases the _______ of the air and increases the temperature. < /p>
***Same exploration
★Student Activity 1: Read 7 pages of the text and answer the following questions:
1) Moving objects have _______, Molecules are constantly moving irregularly, so molecules also have kinetic energy;
2) Objects that undergo elastic deformation have ______ due to the force, and there are also gravitational and repulsive forces interacting between molecules, so molecules There is also ______ in space, and the object ______________________ is called internal energy. 3) Thermal motion of molecules is related to temperature. The higher the temperature, the _______________________ of the molecules, the _____ the kinetic energy of the molecules, and the _________ the internal energy.
4) When the temperature of an object is low, the thermal motion of molecules ______ (stops?), so all objects ________.
Discussion: The difference between internal energy and mechanical energy:
★ Student Activity 2: Methods of changing internal energy
1. Group discussion: How to make a piece of ice Melting? How to increase the internal energy of an iron wire?
Summary: ⑴ There are two ways to change the internal energy of an object: ____ and _____, and they are equivalent in changing the internal energy of an object. of. The essence of heat transfer is ________; the essence of work is ________.
⑵ In the process of heat transfer, high-temperature objects have heat, temperature, and internal energy; low-temperature objects have heat, temperature, and internal energy. (The condition for heat transfer is that there is a temperature difference)
2. Experiment to demonstrate the compressed air ignition device:
Place a small amount of dip in a thick glass cylinder equipped with a piston Use cotton with ether, press the piston down quickly, and observe what happens.
Cause: ,
Explanation: .
3. Experiment: There is some water in a large-mouth glass bottle, and there is water vapor above the water. Pump up the bottle, and when the cork jumps up, observe the changes in the bottle and explain the reason.
Summary: ⑶ When an object does work on an object, its internal energy, temperature, and energy are essentially converted into energy;
When an object performs work on an object, its internal energy, temperature, and energy are essentially converted into energy
★ Student Activity 3: Teamwork
1. 1-minute competition: Give an example of changing the internal energy of an object?
2. Discuss and reach consensus:
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The relationship between internal energy and temperature
⑴Changes in the temperature of an object (will or not) cause changes in internal energy?
⑵If the temperature of an object remains unchanged, its internal energy Can (possibly, not necessarily) change?
The relationship between internal energy and heat
⑴The change in the internal energy of an object (certainly, not necessarily) is accompanied by the absorption or release of heat?
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⑵ Will the object absorb or release heat (certainly, not necessarily) cause changes in internal energy?
The relationship between heat and temperature
⑴ The object absorbs or releases heat ( (certainly, not necessarily) will cause changes in the temperature of objects?
★ Student Activity 4: Student Reading: The Greenhouse Effect of the Earth
1) What is the greenhouse effect? ??
< p> 2) What is the cause of the greenhouse effect? ??