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Grade 11 Kepler's Laws & Orbits Worksheet with Answers

Grade 11 (US) · Year 12 (UK) · Class 11 (India) · Physics

Unit 5: Going FurtherAdvanced: Orbits & the UniverseNGSS HS-ESS1-4Advanced

Using Kepler's third law (T² = a³) to relate a planet's orbit size and period. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Kepler's Laws & Orbits

Grade 11 · Physics

Score___ / 12

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Learning goal: Advanced: Orbits & the Universe · NGSS HS-ESS1-4

Directions: Read each question carefully and write your answer on the line.

RememberOrbits and stars

1. Orbits are ellipses, Sun at one focus.2. Planets move faster near the Sun.3. T² ∝ a³ (farther = longer year)Stars: nebula → star → red giant→ white dwarf (or supernova)
  1. 1

    Using T² = a³ (T in years, a in AU), what is the orbital period of an object at 9 AU?

  2. 2

    Where is a planet moving slowest in its orbit?

  3. 3

    Who discovered the three laws of planetary motion?

  4. 4

    Using T² = a³ (T in years, a in AU), what is the orbital period of an object at 25 AU?

  5. 5

    Using T² = a³ (T in years, a in AU), what is the orbital period of an object at 100 AU?

  6. 6

    Using T² = a³ (T in years, a in AU), what is the orbital period of an object at 16 AU?

  7. 7

    What is one astronomical unit (AU)?

  8. 8

    What shape is a planet's orbit, according to Kepler's first law?

  9. 9

    Using T² = a³ (T in years, a in AU), what is the orbital period of an object at 1 AU?

  10. 10

    According to Kepler's second law, does a planet move faster or slower when it is closer to the sun?

  11. 11

    What is a planet's orbital period?

  12. 12

    Do planets farther from the sun take more or less time to orbit?

★ Challenge corner for fast finishers

You are in a closed room with a candle, a match and a lamp. What do you light first?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/physics/11/keplers_laws

Answer key (click to show)
  1. 1.27 years
  2. 2.at its farthest point from the sun (aphelion)
  3. 3.Johannes Kepler
  4. 4.125 years
  5. 5.1000 years
  6. 6.64 years
  7. 7.the average distance from Earth to the sun
  8. 8.an ellipse, with the sun at one focus
  9. 9.1 years
  10. 10.faster
  11. 11.the time it takes to orbit the sun once
  12. 12.more time
  13. ★the match (challenge corner)

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