Orbits and Satellites
A satellite is an object that orbits a larger body, balancing its forward speed against gravity pulling it inward.
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A satellite is an object that orbits a larger body, balancing its forward speed against gravity pulling it inward.
- Geostationary satellites orbit in 24 hours
- Closer orbits need higher speeds
- Used for communication and weather
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Orbits and Satellites?
Within Physics, which covers forces, energy, waves, electricity, magnetism, light and space explained through motion and experiments, this topic explains Orbits and Satellites. Physics topics explain how things move, push, heat up and carry energy, so each one here pairs a definition with a live model you can change.
Check that you can explain Orbits and Satellites in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Orbits and Satellites explains how the physical world behaves, from sport and transport to electricity and medicine.
Orbits and Satellites in detail
A satellite stays in orbit because gravity provides the centripetal force needed for circular motion. For a circular orbit, GMm/r² = mv²/r, so the speed depends on the orbit radius: closer satellites move faster and have shorter periods.
Geostationary satellites orbit at about 36,000 km above the equator with a period of 24 hours, so they stay above the same point and are used for communications and weather observation. Low Earth orbit satellites circle in about 90 minutes and are used for imaging and navigation. The Moon is Earth's natural satellite.
How the interactive helps you understand Orbits and Satellites
Watch the orbit in the interactive. Use any sliders or buttons it offers to change the values and see how the orbit responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Orbits and Satellites.
Real-life uses and examples
- Use Orbits and Satellites to make sense of a practical and its results.
- Answer “explain” questions by linking Orbits and Satellites to a clear cause and effect.
- Predict what a ball, car or circuit will do with Orbits and Satellites before you do the calculation.
Common mistakes to avoid
- Mixing up Orbits and Satellites with a related quantity that has different units.
- Forgetting that some quantities, such as force or velocity, also have a direction.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Orbits and Satellites
What is Orbits and Satellites?
A satellite is an object that orbits a larger body, balancing its forward speed against gravity pulling it inward.
What are the most important points about Orbits and Satellites?
The main points are: Geostationary satellites orbit in 24 hours; Closer orbits need higher speeds; Used for communication and weather.
Why is Orbits and Satellites useful?
Understanding Orbits and Satellites explains how the physical world behaves, from sport and transport to electricity and medicine.
How can I practise Orbits and Satellites?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Orbits and Satellites?
Related topics in Physics include Simple Harmonic Motion and Pendulums, Elasticity and Materials, Electronics and Logic Gates.