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Eighth Grade (Grade 8) Planetary Motion Questions

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Grade 8 Planetary Motion
Gravity is a repulsive force between any two masses.
  1. True
  2. False
Grade 8 Planetary Motion
The Sun takes 25 days to go around Earth.
  1. True
  2. False
Grade 8 Planetary Motion
Which of the following is NOT true of the Inverse Square Law of Gravitation?
  1. if your distance from center of Earth's gravitational pull doubles, your weight is only 1/4 what it is on the surface
  2. An object's weight decreases exponentially as distance increases
  3. As centers of mass approach one another, their pull on each other increases
  4. All of the above are true of the Inverse Square Law of Gravitation.
Grade 8 Planetary Motion
Which of the following is NOT true of the way planetary rotation affects the length of its day and year?
  1. Earth makes 365.25 rotations during a complete revolution around the sun
  2. Earth takes 23.9 hours to complete one spin on its axis
  3. The gas giants spin on their axes slower than the inner, rocky planets, and therefore have longer days
  4. Every four years, Earth's leftover quarter days are accounted for by adding an extra day to the month of February
Grade 8 Planetary Motion
Planetary orbits around the sun are circular.
  1. True
  2. False
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