Explorations: Introduction to Astronomy (Arny), 6th Edition

Chapter 3: Gravity and Motion

Questions for Review

1
What is meant by inertia?
2
What does Newton's first law of motion tell you about the difference between motion in a straight line and motion along a curve?
3
What is Newton's law of gravity?
4
How does mass differ from weight?
5
If your mass is 70 kilograms on Earth, what is it on the Moon?
6
If you weigh 110 pounds on the Earth, do you weigh 110 pounds on the Moon? Why?
7
What does surface gravity measure?
8
What is meant by escape velocity?
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