GCSE Physics (AQA)

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Stable Orbits

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Space physics Solar system; stability of orbital motions; satellites

Stable Orbits

3:45 Orbits
Spec 4.8.1.3
Previous Orbital Speed Next Main Sequence Star
  • A planet or satellite's orbit is stable if it always follows the same path.
  • Planets orbit the sun, and satellites orbit planets in circular paths due to gravitational attraction.
  • A stable orbit means the object maintains a constant distance from the body it orbits.
  • Earth's stable orbit is crucial for supporting life by maintaining the right distance from the sun.
  • Scientists believe all planets in the solar system have stable orbits.
  • Orbit stability depends on the object's speed and the radius of its orbit.
  • The radius affects the gravitational force acting on the object.
  • If an object moves too slowly, gravity pulls it inward, potentially causing it to crash.
  • If an object moves too fast, it can escape the gravitational field.
  • Satellites must maintain a constant speed to stay in stable orbits.
  • To change speed while keeping an orbit stable, the orbit's radius must also change.
  • A slower-moving object requires a larger orbit to remain stable.

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