Edexcel A-Level Physics A2 5.6.160 Orbital Motion Questions

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

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

[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.

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Edexcel A-Level Physics A2 5.6.160 Orbital Motion Questions question 1