Explorations: An Introduction to Astronomy (Arny), 7th 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
Explain how inertia and gravity are both involved in an orbit.
4
How does mass differ from weight?
5
If your mass is 70 kg on Earth, what is it on the Moon?
6
What is Newton's law of gravity?
7
How can you measure the mass of a planet by studying the motion of a moon orbiting it?
8
If you weigh 110 pounds on the Earth, do you weigh 110 pounds on the Moon? Why?
9
What does surface gravity measure?
10
What is meant by escape velocity?
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