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Paper 2
Space Physics
Both
Gravity keeps planets in orbit.
Key Facts
- Weight depends on gravitational field strength g.
- Orbits are stable when centripetal force balances inertia.
Key Equations
W = m × g
Topics Covered
Orbits & Gravity
What you need to know
- •Gravity provides centripetal force for orbits.
- •Mass causes gravity, weight is force.
Exam Tips
- Use W = mg for weight.
Life Cycle of Stars
What you need to know
- •Nebula → star → red giant/supergiant → white dwarf/neutron star/black hole.
Exam Tips
- Start with star mass: low or high.
Key Terms
Centripetal force
Force towards the centre of a circular path.
Supernova
Explosion of a massive star at the end of its life.
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Common Exam Questions
Calculate the weight of a 60 kg astronaut on Earth (g = 9.8).
2 markseasyPaper 2
Model Answer
588 N
What examiners want to see
- ✓Use W = mg with correct units.
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