For a satellite in a stable orbit, what must be true about the centripetal force

Practice Questions

Q1
For a satellite in a stable orbit, what must be true about the centripetal force and gravitational force?
  1. Centripetal force is greater than gravitational force
  2. Centripetal force is less than gravitational force
  3. Centripetal force equals gravitational force
  4. Centripetal force is independent of gravitational force

Questions & Step-by-Step Solutions

For a satellite in a stable orbit, what must be true about the centripetal force and gravitational force?
  • Step 1: Understand that a satellite in orbit is moving in a circular path.
  • Step 2: Know that to keep moving in a circle, an object needs a force directed towards the center of the circle. This is called centripetal force.
  • Step 3: Recognize that the force that pulls the satellite towards the center of the planet (or body it is orbiting) is called gravitational force.
  • Step 4: For the satellite to stay in a stable orbit, the gravitational force must provide exactly the right amount of centripetal force needed for circular motion.
  • Step 5: Therefore, conclude that in a stable orbit, the centripetal force equals the gravitational force.
  • Centripetal Force – The force required to keep an object moving in a circular path, directed towards the center of the circle.
  • Gravitational Force – The attractive force between two masses, which in this case is the force exerted by the Earth on the satellite.
  • Stable Orbit – A condition where the satellite moves in a circular path at a constant speed, maintaining a balance between gravitational and centripetal forces.
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