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Grade 11 Kepler's Laws & Orbits Worksheet with Answers

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

Unit 6: Going FurtherAdvanced: Earth & Space PreviewNGSS 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 · Science

Score___ / 12

Name

Class

Date

Learning goal: Advanced: Earth & Space Preview · NGSS HS-ESS1-4

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

Example

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

Answer: more time

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 16 AU?

  2. 2

    Using T² = a³ (T in years, a in AU), what is the orbital period of an object at 4 AU?

  3. 3

    Who discovered the three laws of planetary motion?

  4. 4

    What is a planet's orbital period?

  5. 5

    Where is a planet moving slowest in its orbit?

  6. 6

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

  7. 7

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

  8. 8

    What is one astronomical unit (AU)?

  9. 9

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

  10. 10

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

  11. 11

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

  12. 12

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

★ Challenge corner for fast finishers

Why does your breath make fog on a cold window?

How did I do?

Teacher's comments

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

Answer key (click to show)
  1. 1.64 years
  2. 2.8 years
  3. 3.Johannes Kepler
  4. 4.the time it takes to orbit the sun once
  5. 5.at its farthest point from the sun (aphelion)
  6. 6.an ellipse, with the sun at one focus
  7. 7.1 years
  8. 8.the average distance from Earth to the sun
  9. 9.faster
  10. 10.1000 years
  11. 11.27 years
  12. 12.125 years
  13. ★water vapor in your breath condenses on the cold glass (challenge corner)

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