Orbital Motion (T)

• What are the three types of celestial bodies discussed in the video?

  Planets, moons, and artificial satellites
• What is the difference between a natural satellite and an artificial satellite?

  • Natural satellites are celestial bodies like moons that orbit planets.
  • Artificial satellites are manmade objects that orbit Earth or other celestial bodies.
• What is the shape of the Earth's orbit around the Sun?

  Virtually circular
• What holds the Earth in its orbit around the Sun?

  The force of gravity
• What type of orbit does the Moon have around the Earth?

  Circular orbit
• How does the force of gravity affect the Moon's orbit?

  It holds the Moon in its orbit
• What is a geostationary satellite?

  • An artificial satellite that orbits once every 24 hours.
  • It always points to the same part of the Earth.
• How does the force of gravity affect objects in circular orbits?

  It changes the velocity of the object but not its speed
• What is the difference between speed and velocity?

  Velocity includes direction, while speed does not
• What happens to the velocity of an object in a circular orbit?

  The velocity is constantly changing due to the change in direction
• What must happen to the radius of an orbit if the speed of a satellite changes?

  • If the speed increases, the radius must decrease.
  • If the speed decreases, the radius must increase.
• Why does a satellite need to move closer to Earth if its speed increases?

  To increase the gravitational force that keeps it in a stable orbit
• What is the relationship between speed and gravitational force for satellites?

  Higher speed requires a greater gravitational force