"Shadow in the Sun" Light PPT Download

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"Shadow in the Sun" Light PPT Download

Part One: Experimental Exploration

Sun: east-south-west

Shadow: west-north-east

After observation, we found:

The length of the shadow changes: it is long in the early morning, gradually becomes shorter, is shortest at noon, then becomes longer, and is longest when the sun is about to set in the west.

The shadow is shortest when the sun is at its highest and longest when the sun is at its lowest.

The direction and length of the shadow change with the direction and position of the sun.

People have known for a long time that they can measure time by using the changing patterns of shadows of objects under sunlight.

Shadow in the Sun PPT, Part 2: Knowledge Extension

Our country has a vast territory, and Beijing time is used throughout the country. In Beijing, the sun is at its highest position throughout the day, and the shadow is at its shortest at 12:14 noon.

Expand and extend

A sundial refers to a timekeeping instrument used by humans in ancient times to measure time using the shadow of the sun, also known as a "sundial". The principle is to use the projection direction of the sun to determine and divide the time, which is usually composed of a dial needle and a dial surface.

Shadow in the Sun PPT, Part 3: Classroom Training

1. Fill in the blanks

1. The sundial is made based on the ( ) principle.

2. People have known for a long time to use the changing pattern of ( ) to measure time.

3. The direction of the shadow of an object under sunlight follows the direction of the sun ( ), and the shadow is always in the direction of the sun ( ).

4. Our country adopts ( ).

2. Choice

1. The shadow of the flagpole in the sun is 10 meters long. After a while, the flagpole becomes shorter. This phenomenon occurs in ( )

A.morning B.noon C.afternoon

2. At the same time, the shadows of different objects under the sun ( )

A. Same shape B. Same direction C. Same length

3. During the day, the shadow of an object under the sun ( ) is the longest

A.Morning B.Noon C.Evening

Shadows in the Sun PPT, Part 4: Class Summary

1. The direction of the shadow of an object under sunlight changes with the change of the direction of the sun. The shadow is always opposite to the direction of the sun.

2. The length of the shadow of an object under sunlight changes with the position of the sun in the sky. When the sun is at its highest position, the shadow is the shortest, and when the sun is at the lowest position, the shadow is the longest.

Shadow in the Sun PPT, Part 5: Homework

Collect relevant knowledge about light after class.

Keywords: free download of Chinese PPT courseware for the fifth grade in the textbook edition, download of Shadow in the Sun PPT, download of Light PPT, .PPT format;

For more information about the PPT courseware "Light and Shadow in the Sun", please click on the "Light ppt and Shadow in the Sun" ppt tag.

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Update Time: 2024-09-07

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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