Objectives
1. Distinguish between g (the accelertation due to gravity) and G
(the universal gravitational constant).
2. Describe a gravitational field.
13.2 Gravitational Field Inside a Planet
3. Describe the gravitational field of the Earth both inside and ouside
the Earth's surface.
13.3 Weigh and Weightlessness
4. Explain why an astronaut in Earth orbit seems seightless even
though there is a gravitational force on the astronaut.
13.4 Ocean Tides
5. Explain how the moon and the sun cause the ocean tides.
6. Explain the difference between the solar and lunar eclipse.
7. Explain the difference between spring tides and neap tides.
13.5 Tides in the EArth and Atmosphere
8. Give examples of tides other than those in water.
13.6 Black Holes
9. Describe how a black hole is formed.
Misconceptions
Note: The following statements are all FALSE!!!
1. The fact that the same side of the moon faces EArth is evidence that
the moon doesn't spin about its axis.
2. The crescent shape of the moon is created by the Earth's shadow.
3. The fact that the moon is the chief cause of ocean tides is evidence that
the moon's pull on the Earth is greater than the sun's pull.
4. Just as the moon greatly affects the oceans, it also affects the fluids
in our bodies.