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Authoritative PPT Summary
"Shadow in the Sun" Accompanying Our Sun and Moon 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.
Which of the following are light sources?
Note: The moon is not a light source. It emits light by reflecting sunlight.
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.
science in life
1. Have we ever seen shadows in the sun?
2. How do the direction and length of shadows change in the morning, noon, and evening?
shadow in sunlight
Changes in shadow length: longer in the morning, gradually shorter, and shortest at noon.
Then it becomes longer, reaching its longest length when the sun is about to set in the west.
When the sun is at its highest, the shadow is the shortest, and when the sun is at its lowest, the shadow is the longest.
Do it:
How does the sun change direction throughout the day?
East - South - West
How does the height of the sun change throughout the day?
low - high - low
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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