"Light and Shadow" colorful light PPT courseware

Description

"Light and Shadow" colorful light PPT courseware

1. Understanding the light source

Note: The moon is not a source of light, it does not emit light on its own, it only reflects the light of the sun

Light source definition:

An object that emits light by itself like a light bulb

2. Conditions for shadow generation

light source occlusion screen

Activity one:

1. First spread 4-inch white paper on the table, and place the small wooden blocks vertically on the white paper.

2. Use a flashlight to illuminate small wooden blocks from different positions

3. Finally, draw the shadows of the wooden blocks on the white paper.

Activity 2:

1. Use a flashlight to illuminate three obstructions at different distances from the table.

2. Draw their shadows on the screen.

3. Fill in the experimental results on the record sheet.

Summary of the whole lesson

What did you learn about light today? What patterns were discovered?

1. Light source: An object that is emitting light and emits its own light is called a light source.

2. Conditions for producing shadows: light source, obstruction and screen, and the obstruction must be between the light source and the screen.

3. Characteristics of shadow: the length and direction of the object’s shadow change with the change of the position and direction of the light source; the size of the object’s shadow is related to the distance between the object and the light source; the shape of the object’s shadow is related to the shape of the side of the object illuminated by the light source. related.

4. The shadow of an object illuminated from different sides is called projection, and projection is very useful in our lives.

Expansion exercises

1. What happens to the shadow when you change the position of the light source?

2. What happens to the shadow when the distance of the object from the light source is changed?

3. Let the light source illuminate different sides of your hand. What are the differences in the shadows you get?

after class homework

1. Continue to play the hand shadow game after class, do experiments in the game, and consolidate the laws of shadows.

2. Observe and measure your own shadow in the sun and complete the following table

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For more information about the "Colorful Light and Shadow" PPT courseware, please click the "Colorful Light ppt Light and Shadow ppt" tab.

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"Light and Shadow" PowerPoint animation download:

This PowerPoint animation, with the theme of light and shadow, tells relevant content about life, emotion, and growth. PPT animation uses black as the background color, and uses light bulbs, film and other materials as PPT background images. It is a dynamic PPT animation with personality and artistic flavor..

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Update Time: 2024-06-30

This template belongs to science courseware Hunan Education Edition Third Grade Science Volume 2 industry PPT template

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