Table of Contents

Preface
Author biography
1 Motivation
2 Getting ready
2．1 Anticipatory set
2．2 Objective
2．3 Purpose

3 Giving information
3．1 Instructional input
3．1．1 History of modern astronomy
3．1．2 The universal law of gravitation
3．1．3 Determining the universal gravitation constant，G
3．2 Modeling
3．3 Instructional input
3．3．1 Weight
3．4 Modeling
3．5 Instructional input
3．5．1 The 'field'
3．5．2 Calculating the gravitational field
3．6 Modeling
3．7 Checking for understanding

4 Keeping information
4．1 Closure
4．2 Independent practice
4．3 Peer teaching
4．3．1 Universal Law of Gravitation and Weight
4．3．2 The Gravitational Field
编辑手记

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