Higher:
描述挤压、弯折、扭转和拉伸，同时提到力的方向。
Middle:
描述挤压、弯折、扭转和拉伸之间的区别。
Lower:
演示挤压、弯折、扭转和拉伸。
Higher:
Middle:
Lower:
Higher:
Middle:
Lower:
Observe how the children sort the objects. Can the children suggest objects that can be changed in different ways?
Are the children using vocabulary correctly?
Can they record their findings on a table?
Can they use the table to answer questions about the ways different materials can be changed?
Can they give reasons based on their observations, as to why objects made from the same materials can have different properties?
The Science Behind the Science
It is important to distinguish between objects and the materials they are made from. It is also important to realise that different materials can have different properties depending on how they have been treated or manufactured.
Silly putty is made from polydimethylsiloxane (PDMS) and this is what gives the putty its unique qualities. It is a polymer, which means it is made from a repeating chain. In the case of silly putty, the chain is Si-O-Si (silicone-oxygen-silicone) and this will repeat throughout the putty. Polymers often have characteristics of stretchiness and flexibility. Silly putty is elastic and also able to act as a liquid because its polymer chains are very long and due to their length, they become entangled with one another.
Find out how shapes of solid objects made from some materials can be changed by squashing, bending, twisting, and stretching.
Forces, electricity and waves - Forces - By investigating forces on toys and other objects, I can predict the effect on the shape or motion of objects. SCN 1-07a
The study of the properties, behaviours and uses of materials, both natural and human-made; the origins of human-made materials and how they are manipulated to suit a purpose.
Observing closely, using simple equipment/gathering and recording data to help in answering questions.
To recognise that different objects can have different properties, and to sort objects according to how their shapes can be changed.
Grade 3 - Matter.
1 年级 - 自然科学 - 物质 - 无处不在的物质 - 固体 - 固体有哪些性质？
科学观察：描述常见物体的基本特征，识别生活中常见的材料，了解常见的力。在老师的指导下，运用观察和描述的方法进行比较和分类，并得出结论。
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