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Third Grade Science Volume 1, Textbook Edition
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Category | Format | Size |
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Third Grade Science Volume 1, Textbook Edition | pptx | 6 MB |
Description
"Comparative Resilience" Materials Around Us PPT Courseware 5
cognitive introduction
Many items need to be tough and able to deform but not break.
Of these four items, which one has better toughness?
scientific inquiry
Specific requirements:
1. Mark the scales on wooden strips, cardboard strips, iron sheets and plastic strips of the same width and thickness respectively, then press one end of these four materials with a heavy object, and the other end extends 5 cm (or 10 cm) out of the table. cm, 15 cm) and hang a weight of the same weight.
2. Glue a piece of paper to one side of the table, mark the position of the weight when the ruler does not extend out of the table and the position it reaches after bending, and then use the ruler to measure their lengths. as the picture shows:
Experimental results:
Plastic strips have a greater degree of bending, while wooden strips have a smaller degree of bending. The greater the bending degree of the material, the stronger the toughness of the material.
Knowledge expansion
Knowledge window: Plastic is an artificial material extracted from crude oil. It is not easy to decompose under natural conditions and will cause serious environmental pollution. But many plastics can be reused.
Let’s talk about it: What plastic products in life can be reused, and why can they be reused?
The plastic bags, foam plastics, beverage bottles, etc. we commonly use in our daily lives can be recycled and reused because they can be repeatedly melted and formed.
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For more information about the PPT courseware "The Materials Around Us Are Comparatively Tough", please click on the Materials Around Us PPT Comparative Toughness ppt tag.
"Comparative Resilience" Materials Around Us PPT Courseware 4:
"Comparative Resilience" Materials Around Us PPT Courseware 4 What is toughness? Toughness refers to the property of an object that is not easily broken after being deformed by force. How to compare toughness? The greater the curvature, the greater the toughness. Experimental steps 1. Mark the wooden strips, iron strips and plastic strips with a ruler..
"Comparative Resilience" Materials Around Us PPT Courseware 3:
"Comparative Toughness" Materials Around Us PPT Courseware 3 Understanding Toughness Toughness refers to the property of an object that is not easily broken after being deformed by force. Scientific inquiry Specific requirements: 1. Mark the scales on wooden strips, iron sheets and plastic strips of the same width and thickness, and then...
"Comparative Resilience" Materials Around Us PPT Courseware 2:
"Comparative Toughness" Materials Around Us PPT Courseware 2 Understanding Toughness We call the characteristic of materials that are not easily broken after being deformed by force called toughness. Which material is tougher? Understand plastics. Understand the following plastic products. What properties of plastics do they utilize? Key words..
File Info
Update Time: 2024-09-10
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