The force of gravity does NOT do work on an object that is:
a. falling.
b. rising.
c. stationary.
d. a falling piece of writing paper.
e. being pushed upwards.
Question 2
If the orbit is elliptical, rather than circular, what can be said about the work done by the Sun on Earth?
a. It does not matter whether the orbit is circular or elliptical, no work is done.
b. If the orbit is elliptical, work is done to speed up or to slow down Earth, depending on its location in orbit.
c. Whether the orbit is circular or elliptical, work must be done to propel Earth around the Sun.
d. The work the Sun does on Earth accounts for Earth's changes of season.
e. The work the Sun does on Earth causes the tides.
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