Western Normal University Edition First Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
Hebei Education Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
People's Education High School Mathematics Edition B Compulsory Course 2
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 2
Jiangsu Education Edition Fourth Grade Mathematics Volume 1
Qingdao Edition Second Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
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Category | Format | Size |
---|---|---|
People's Education Press Ninth Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"Projection" Projection and View PPT Courseware 8
teaching objectives
knowledge and abilities
Understand the concepts of projection and be able to identify the projection of objects based on the direction of light.
Learn the meaning of central projection and parallel projection and their simple applications through examples.
Understand the meaning of orthographic projection and be able to draw the orthographic projection of simple plane figures based on the properties of orthographic projection.
Process and Method
Through students' recall, operation, imagination, reasoning, communication and other mathematical activities, students can initially establish spatial concepts and develop geometric intuition.
Emotional attitudes and values
Be willing to be exposed to mathematical information in the social environment, be willing to talk about certain mathematical topics, be able to play an active role in mathematical activities, and feel the wisdom of the ancient Chinese working people and the profoundness of the traditional Chinese culture.
Important and difficult points in teaching
Distinguish between parallel projection and central projection, and their applications in life.
Understand the meaning of orthographic projection and be able to draw the orthographic projection of simple plane figures based on the properties of orthographic projection.
Analysis and application of comprehensive problems in mathematics and physics.
Knowledge points
Generally, when an object is illuminated with light, the shadow obtained on a certain plane (floor, wall, etc.) is called the projection of the object.
review
In Chapter 2 "Light Phenomena" of "Eighth Grade Physics Volume 1", we learned the concept of light.
In order to represent the propagation of light, we usually use a straight line with an arrow to represent the path and direction of light. Such straight lines are called rays.
Projections formed by parallel rays are parallel projections.
observe
What is the difference between the projected lines in the two images below?
What projections do they form?
Knowledge points
The projection produced by the projection line perpendicular to the projection surface is called orthographic projection.
Fix the projection surface and change the position and direction of the stick. What changes will happen to its shadow?
When a certain surface of an object is parallel to the projection surface, the orthographic projection of this surface will be exactly the same shape and size as this surface.
example
Draw the orthographic projection of the cube placed as shown in the figure on the projection plane P.
(1) One face ABCD of the cube is parallel to the projection plane P;
(2) One surface ABCD of the cube is inclined to the projection surface P, and the upper bottom surface ADEF is perpendicular to the projection surface P.
Class summary
1. Projection: When an object is illuminated by light, it will leave its shadow on the ground or wall. This is projection.
2. Parallel projection: Generally, the projection formed by parallel light rays is parallel projection.
3. Central projection: The projection formed by the light rays emitted from the same point (electric light source) is called central projection.
Practice in class
1. The picture below is the shadow of two trees at the same time. Please draw the light rays that create the shadow of the tree in the picture. Are these rays of sunlight or lights?
Because the light is not parallel light, it is not sunlight, but the light of the light. The light of the light is emitted from one point.
2. The picture below is the shadow of two trees at the same time. Please draw the light rays that create the shadow of the tree in the picture. Are they sunlight or lights? Draw the shadow of the flagpole at the same moment.
3. Given the two wooden poles and their respective shadows, determine the location of the street light bulb.
Solution: Draw a straight line through the top of one wooden pole, and then draw a straight line through the top of the other wooden pole. The two straight lines intersect at point O. Point O is where the street light bulb is.
4. Opposite a street lamp, there is a glass curtain wall. There is a pot of flowers and a tree on the ground in front of the curtain wall. At night, the curtain wall reflects the street light, forming the shadow of the potted flower, and the tree shadow is formed by the street light. Can you determine the location of the street light source at this time?
5. Xiao Ming and his father are walking on the beach in the sun. He doesn’t want his father to see his shadow. Can you draw the approximate range of Xiao Ming’s activities?
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Projector curtain whiteboard PPT background picture:
This is a projector curtain whiteboard PPT background picture; Keywords: curtain, whiteboard PowerPoint background picture, still life slide background picture, .jpg format;..
"Projection" PPT courseware:
"Projection" PPT courseware Part One: Introduction of new lesson Do you know the relationship between objects and shadows? When objects are illuminated by sunlight or lights, they will form shadows on the ground, walls, etc. It can be seen that shadows are closely related to the shape of objects. Object and its...
"Projection" PPT:
"Projection" PPT Part One Content: Concept The light of candles and light bulbs can be seen as emitting from one point. Like this, the projection formed by the light emitted from a point shining on the object is called central projection. Sun rays and searchlights...
File Info
Update Time: 2024-09-12
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