๐ฏ Common Question Types:
- Explain orbit in terms of gravity and centripetal force (2โ3 marks)
- Calculate orbital speed using v = 2ฯr / T (3 marks)
- Compare circular vs elliptical orbit properties (3โ4 marks)
- Describe satellite types and their uses (2 marks)
โ ๏ธ Common Mistakes to Avoid:
- Saying gravity "pushes" an orbiting object โ gravity always pulls towards the centre
- Thinking a closer orbit means slower speed โ it is faster (stronger gravity needed)
- Confusing orbital period with orbital speed โ further orbit means both longer period AND slower speed
This exam tips covers Exam Tips for Orbits within Orbits for GCSE Physics. Revise Orbits in Space Physics for GCSE Physics with 14 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.
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