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Edexcel A-Level Physics Orbital Motion

Review orbital motion in Edexcel A-Level Physics through Kepler-law calculations, circular-orbit derivations, satellite periods and weightlessness.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
A2

Exam points

  • derive or use T² ∝ r³ by combining gravity with centripetal force in circular orbits
  • calculate orbital periods or radii for planets, moons and satellites from mass and distance data
  • assess orbit claims or choices using period, angular speed, polar-orbit and weightlessness ideas

5.6.160 - Orbital motion question 1

[Maximum number: 3]

The Sun is a main sequence star.

As the Sun continues its evolution, its mass will decrease. It is estimated that at its largest radius, the mass of the Sun will have decreased significantly.

Explain how the orbital period of a planet would change as the mass of the Sun decreases.

Assume that the radius of the planet’s orbit about the Sun does not change.

Figure for Question 5.6.160 - Orbital motion question 1 — Edexcel A-Level Physics A2
Figure for Question 5.6.160 - Orbital motion question 1 — Edexcel A-Level Physics A2
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