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You
are to complete this assignment –getting help as needed. Show the
completed assignment to the teacher by the due date. Then check your answers
with the answer book in the classroom and ask any further questions you may
have.
Do
your work on a separate sheet of paper.
1. Use pictures, and as few words as possible
words, to describe each of KeplerÕs 3 laws. Correctly number each law in your
pictures.
2. A space ship is moved 4 times as far away
from the Earth, how will its new force of attraction compare to its old force
of attraction?
3. A MartianÕs spaceship move 3 times closer to
the planet Mars. How will his new force of attraction compare to his old?
4. An asteroid moves to a position where the
pull of gravity is 16 times greater. How does the new distance compare to the
old?
5. A Venusian moves to a position from the Sun
where the force of gravity is 1/625 times the old force. How does this new
position compare to the Sun compare to the old position?
6. Use the data below to show KeplerÕs thirds
law works add what you know about the Earth.

Venus 
Mars 
Earth 
Orbital radius 
0.723 AUÕs 
1.52 AUÕs 

OrbitÕs period 
0.665 yrs 
1.88 yrs 





7. Mars has two moons that orbit it. Deimos and
Phobos. Deimos takes 1.26244 days to go around Mars once. Deimos is 23,459 km
from Mars. Phobos takes 0.31891 days (7.65 hours) to go around Mars. PhobosÕ
mass is 1.08 x 10^{16} kg. If the force of attraction between Mars and
Phoebos is 5.26 x 10^{15 }N, then what is the mass of Mars?
by Tony Wayne ...(If you are a teacher, please feel free to use these resources in your teaching.)