This exam tips covers Exam Tips for Orbits within Orbits for GCSE Physics. Revise Orbits in Space Physics for GCSE Physics with 13 exam-style questions and 10 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 7 of 8 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
💡 Exam Tips for Orbits
🎯 Common Question Types:
- Explain orbit in terms of gravity and centripetal force (2–3 marks)
- Calculate orbital speed using v = 2πr / T (3 marks)
- Compare circular vs elliptical orbit properties (3–4 marks)
- Describe satellite types and their uses (2 marks)
⚠️ Common Mistakes to Avoid:
- Saying gravity "pushes" an orbiting object — gravity always pulls towards the centre
- Thinking a closer orbit means slower speed — it is faster (stronger gravity needed)
- Confusing orbital period with orbital speed — further orbit means both longer period AND slower speed
Practice questions for Orbits
What is a protostar?
Explain why a main sequence star remains stable (in equilibrium) for billions of years.
Quick recall flashcards
What is Low Earth Orbit (LEO)?
Orbit at 200-2000 km altitude with ~90 minute orbital period. Used for ISS, imaging, and Earth observation
What is a polar orbit used for?
Mapping - the satellite orbits at ~800 km altitude covering the whole Earth as the planet rotates beneath it