What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.13.3.1Derive, from Newton’s law of gravitation and the definition of gravitational• derive, from Newton’s law of gravitation and the definition of gravitational field, the equation g = GM / r 2 for the gravitational field strength due to a point massSyllabus objective13.3.2G = GM / r 2• recall and use g = GM / r 2Syllabus objective13.3.3G is approximately constant for small changes in height near the Earth’s• understand why g is approximately constant for small changes in height near the Earth’s surfaceSyllabus objective