2-PS1.1 - Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.
2-PS1.2 Analyze data obtained from testing different materials to determine which materials have the properties that are best suited for an intended purpose.*
2-PS1.3 Make observations to construct an evidence-based account of how an object made of a small set of pieces can be disassembled and made into a new object.
Waterproof 防水 Absorbent 能吸收 Rigid 坚硬 Flexible 易弯曲 Texture xxx Rough 粗糙 Smooth 光滑 Transparent 透明 opaque 不透明 sticky 胶粘 melt xxx soft 软 hard 硬 Bend xxx Sink 沉 float 浮 elastic (stretchy) 有弹性 curved 弯 straight 直 big 大 small 小 thin 薄 thick 厚 strong 强 weak 弱 fragile 易碎 tough 有韧性 heavy 重 light 轻
Materials have properties that can make them useful for an intended purpose.
不同的材料有不同的属性，这些属性可以满足我们对不同用途的需求。
How can you describe a material based on its property?
如何形容一个材料的属性？
How can you classify a material based on its properties?
如何以材料的属性来进行分类？
Why do we choose a particular material for an intended purpose?
我们如何根据不同的用途，选择适合的材料？
