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"Comparative Resilience" Materials Around Us PPT Courseware 3
awareness of resilience
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, 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 , 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:
scientific inquiry
Experimental conclusion: The bending degree of plastic strips is large, and the bending degree of wooden strips is small. The greater the bending degree of the material, the stronger the toughness of the material.
Knowledge explanation
① Most plastics are light in weight, chemically stable, and will not rust; ② have good impact resistance; ③ have good transparency and wear resistance; ④ have good insulation and low thermal conductivity; ⑤ general formability and colorability Good, low processing cost; ⑥ Most plastics have poor heat resistance, large thermal expansion rate, and are easy to burn; ⑦ Poor dimensional stability, easy to deform; ⑧ Most plastics have poor low temperature resistance and become brittle at low temperatures; ⑨ Easy to age; ⑩ Some plastics are easy to Soluble in solvents.
Plastics can be divided into two categories: thermosets and thermoplastics. The former cannot be reshaped and used, while the latter can be repeatedly produced.
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.
Give it a try:
1. Toughness refers to the property of an object that is not easily ______ after being deformed by force.
2. When doing toughness comparison experiments, fairness must be achieved. Which of the following is one of the fairness aspects? ( )
A. The length of the wooden, metal and plastic strips used in experiment should be the same, and the width does not matter.
B. The weights hung on wooden bars, metal bars and plastic bars should be the same.
C When measuring, the lengths of wooden strips, metal strips and plastic strips protruding from the table can be different.
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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 5:
"Comparative Toughness" Materials Around Us PPT Courseware 5 Cognition 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. Put wooden strips and cardboard strips of the same width and thickness...
"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 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..