"Shadows in the Sun" Light PPT Courseware

"Shadows in the Sun" Light PPT Courseware
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Fifth Grade Science Volume 1, Textbook Edition pptx 6 MB
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"Shadows in the Sun" Light PPT Courseware

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"Shadows in the Sun" Light PPT Courseware

1. What is a light source? An object that emits its own light is called a light source.

2. What is projection?

The shadow of an object illuminated from different sides is called a projection.

1. The conditions required for shadow generation are light source, obstruction, and screen (and the obstruction must be between the light source and the screen)

2. The shadow of an object illuminated from different sides is called a projection.

3. The length of the object’s shadow is related to the angle of the light source;

The size of the object's shadow is related to the distance between the obstruction and the light source;

The shape of an object's shadow is related to the shape of the side of the object illuminated by the light source.

Key points of the previous lesson:

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

2. Objects that can emit their own light are called light sources.

3. 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.

4. The shadows of objects illuminated from different sides are called projections. Projections are very useful in our lives.

Light from the sun travels at about 300,000 kilometers per second. Nothing travels faster than light. Light allows us to see things around us, and the sun is the main source of light.

Class exercises

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. ( )

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

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.

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

"Shadows in the Sun" light PPT teaching courseware:

"Shadows in the Sun" Light PPT Teaching Courseware Part One: Introduction of New Lessons Have we ever seen shadows in the sun? Do shadows in sunlight change throughout the day, and how? Today we are going to learn about it. ... ... ... Shadow in the Sun PP..

"Shadow in the Sun" Light PPT download:

"Shadows in the Sun" Light PPT Download Part 1 content: Experimental exploration of the sun: East to South West Shadow: West to North East After observation, we found: Changes in shadow length: long in the early morning, gradually shorter, shortest at noon, then longer, to the sun It is longest in the west near sunset. ..

"Shadow in the Sun" Light PPT:

"Shadow in the Sun" Light PPT Part One: Observing the changes in the shadow of objects under the sun Let us verify our ideas through actual observations. Find a pencil (or a chopstick) about 10 cm long, a smooth wooden board, and a...

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Update Time: 2024-09-07

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《阳光下的影子》光PPT课件(1)《阳光下的影子》光PPT课件(2)
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