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A. Systems
By the end of 2nd grade, students should know that:
- Most things are made of parts.
- Something may not work if some of its parts are missing.
- When parts are put together, they can do things that they couldn't do by themselves.
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B. Models
By the end of 2nd grade, students should know that:
- Many of the toys children play with are like real things only in some ways.
- A model of something is different from the real thing but can be used to learn something about the real thing.
- One way to describe something is to say how it is like something else.
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C. Constancy and Change
By the end of 2nd grade, students should know that:
- Things change in some ways and stay the same in some ways.
- People can keep track of some things, seeing where they come from and where they go.
- Things can change in different ways, such as in size, weight, color, and movement.
- Some changes are so slow or so fast that they are hard to see.
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D. Scale
By the end of 2nd grade, students should know that:
- Things in nature and things people make have very different sizes, weights, ages, and speeds.
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