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Authoritative PPT Summary
"Why Shadows Change" Flagpole and Shadow PPT Courseware 4
Conditions for shadow generation:
What are the conditions needed to see clear shadows?
Have light and opaque objects.
To see a clear shadow, you must shine light on an opaque object to see it.
light opaque object shadow
Ask research questions
1 Why does the shadow change?
2. What is the relationship between the changes in the position of the sun and shadows throughout the day?
2. Speculation and Verification
1 Characteristics and rules of shadow changes of objects under sunlight:
In the morning, the shadow points to the west;
At noon, the shadow points due north;
In the evening, the shadow points eastward.
During the day, the shadow is shortest at noon and longer in the morning and evening.
What else did you discover?
Question one
Why do shadow changes follow certain patterns?
Conclusion: The change of shadow is related to the change of the sun throughout the day. As time changes, the shadow will continue to change.
Question 2
How is the shadow of the flagpole formed?
Conclusion: As the sun rises in the east and sets in the west, the position of the sun changes, and the position of the shadow also changes accordingly. The higher the sun is, the shorter the shadow.
2. Characteristics and rules of changes in the position of the sun and changes in shadows of objects under sunlight:
Any opaque object under the sun has a shadow, and the shadow is on the side of the object facing away from the sun; at the same moment, the shadow direction of any upright object is the same. The shadow of an object under sunlight changes in direction and length throughout the day. In the morning, the shadow points to the west; at noon, the shadow points to the north; in the evening, the shadow points to the east. During the day, the shadow is shortest at noon and longer in the morning and evening.
Question three
When the shadow length of an object changes, how does the temperature change?
Conclusion: The higher the sun, the shorter the shadow, and the higher the temperature; the lower the sun, the longer the shadow, and the lower the temperature.
Hands-on painting:
Ask each group leader to take out the file bag from the desk. There are three unfinished paintings in it. Ask every two people in the group to work together to draw one, and draw the shadow of the object in the sun.
Communicate and discuss with each other: Ask each group to take a look below to see if there is any mistake in drawing your shadow. If so, please correct it.
Discuss: The three pictures below were taken at the same location at different times in the morning somewhere in northern my country.
Please arrange them in the order in which they were taken and explain your reasons.
Summary: The characteristics and rules of changes in the position of the sun and changes in the shadow of objects under the sun
Any opaque object under the sun has a shadow, and the shadow is on the side of the object facing away from the sun; at the same moment, the direction of the shadow of any upright object is the same. The shadow of an object under sunlight changes in direction and length throughout the day. In the morning, the shadow points to the west; at noon, the shadow points to the north; in the afternoon, the shadow points to the east. During the day, the shadow is shorter at noon and longer in the morning and evening.
After class practice
When the shadow is the shortest at noon every day, measure the length of the shadow of an upright object, and observe and record it continuously for one year. Predict what natural mysteries you might discover?
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For more information about the "Flagpole and Shadow Why the Shadow Changes" PPT courseware, please click the Flagpole and Shadow ppt Why the Shadow Changes ppt tag.
"Why Does the Shadow Change" Flagpole and Shadow PPT Courseware 3:
"Why Shadows Change" Flagpole and Shadow PPT Courseware 3 Teaching Objectives: 1. Through teaching, let students know the movement pattern of the sun in the sky every day; understand that the changes in temperature and shadow throughout the day are related to the movement of the sun. 2. Able to use simple measuring tools..
"Why Does the Shadow Change" Flagpole and Shadow PPT Courseware 2:
"Why does the shadow change" Flagpole and Shadow PPT Courseware 2 Conditions for shadow production: What conditions are needed to see a clear shadow? Have light and opaque objects. To see a clear shadow, you must shine light on an opaque object to see it.
"Why does the shadow change" flagpole and shadow PPT courseware:
"Why Does the Shadow Change" Flagpole and Shadow PPT Courseware Conditions for shadow production: What conditions are needed to see a clear shadow? Have light and opaque objects. To see a clear shadow, you must shine light on an opaque object to see it.