GCSE Physics (AQA)

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Orbits & Circular Motion

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Space physics Solar system; stability of orbital motions; satellites

Orbits & Circular Motion

3:34 Orbits
Spec 4.8.1.3
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  • Planets and satellites travel in orbits due to gravity pulling them towards the center.
  • Orbits are circular paths around the sun or planets.
  • The moon is a natural satellite orbiting the earth.
  • Velocity is a vector quantity indicating speed and direction.
  • Gravitational force causes the moon's velocity to constantly change.
  • According to Newton's second law, a force causes an object to accelerate, changing its velocity.
  • The gravitational force makes the moon accelerate, changing its direction of motion.
  • The force always points towards the earth, changing direction as the moon moves.
  • Velocity points in the direction of motion, while the force is perpendicular, pointing to the orbit's center.
  • For circular orbits, only the direction of velocity changes, not the speed.
  • Orbits are technically elliptical but treated as circular for simplicity.
  • In circular motion, speed remains constant while velocity changes direction.
  • The moon's velocity has the same magnitude but changes direction to maintain its circular path.
  • Despite constant speed, velocity changes due to direction change.
  • Understanding the relationship between orbits, circular motion, and gravity's effect on velocity is important for exams.

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