"Sun and Shadow" PPT

Description

Hunan Education Edition fifth grade science volume 2, sun and shadow PPT

Part One: Take a guess

Take a guess

You have it, I have it and he has it too,

Black body, black legs, black heads,

I will follow you in front of the lamp and under the moon,

Just never spoke.

Talk about it

After completing these two games, did you gain anything?

What conditions need to be met to see a clear shadow?

Sun and shadow PPT, part 2: think about it

think about it

Is the shadow of an object constant?

What is the relationship between shadow and sun?

How does the length and direction of the shadow of the same object change during the day?

The sun rises in the east and sets in the west; in the morning and evening the sun shines obliquely on the ground, and the temperature is relatively low. At noon the sun shines directly on the ground and the temperature is relatively high.

The relationship between the sun, objects and shadows

In the morning, the shadow points: west

At noon, the shadow points: due north

In the evening, the shadow points: east

The working principle of a sundial: the sun rises in the east and sets in the west, and the shadows of the objects it illuminates will also move with it. In ancient times, people learned to calculate time and discovered the sundial by observing this natural phenomenon. The sundial is the oldest timekeeping instrument that uses the shadow of the sun to measure time. Today it has become a symbol of human civilization. Our country has a long history and developed culture. It is also one of the earliest ancient civilizations in the world to use sundials to measure time. The earliest stone sundial discovered in my country so far is a relic from the early Western Han Dynasty and has a history of about 2,200 years. In the history of many ancient scientific and technological achievements in our country, the sundial made and applied based on the principle of heliometry can be said to be a crystal-clear pearl.

Sun and Shadow PPT, Part 3: Practice Questions

1. Judgment questions

1. The shadow of an object under the sun does not change throughout the day. ( )

2. The shadow of an object is always on the side backlit by the sun. ( )

3. The shorter the shadow, the higher the position of the sun. ( )

4. When the sun rises in the east in the morning, the shadow of the object is in the east. ( )

5. At the same time, the shadows of different objects under the sun have the same direction. ( )

2. Multiple choice questions

1. At the same time, the shadows of different objects in the sun ( ).

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

2. The shadow of the same object in the sun at different times ( ).

A. The position remains unchanged. B. The direction remains unchanged. C. The length, position and direction all change.

3. The shadow of the flagpole in the sun is 5 meters long. After a while, the shadow of the flagpole becomes longer. This phenomenon occurs in ( ).

A. Morning B. Noon C. Afternoon

4. A 10 cm pencil stands upright on the ground in the sun. Its shadow is 5 cm long. At the same time, the length of the shadow of the flagpole is measured to be 2 meters. The actual height of the flagpole is approximately ( ) meters.

A. 2 meters B. 2.5 meters C. 4 meters

Sun and shadow PPT, part 4 content: key points of this section

Key points of this section:

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.

Keywords: Hunan Education Edition fifth grade science PPT courseware for the second volume free download, Sun and Shadow PPT download, .PPT format;

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"Sun and Shadow" PPT courseware:

Hunan Education Edition fifth grade science, volume 2, Sun and Shadow PPT courseware, part one: Conditions for shadow generation. Conditions for shadow generation. What conditions are needed to see a clear shadow? Have light and opaque objects. To see a clear shadow, you must...

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Update Time: 2024-09-30

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