Solar system; stability of orbital motions; satellites — WJEC GCSE Physics
In summary: Solar system; stability of orbital motions; satellites is a key topic in WJEC GCSE Physics. Key exam tip: Ensure you can explain why an orbiting body has a changing velocity even if its speed is constant
Exam Tips for Solar system; stability of orbital motions; satellites
- Ensure you can explain why an orbiting body has a changing velocity even if its speed is constant
- Be prepared to describe the life cycle of the Sun in terms of gravitational forces and fusion energy
- Use precise terminology when distinguishing between natural moons and artificial satellites
Common Mistakes
- Confusing the difference between speed and velocity in circular orbits
- Incorrectly describing the relationship between orbital radius and orbital speed
- Failing to mention the role of fusion energy in maintaining stellar equilibrium
Marking Points
- Recall the order, size, orbits, and composition of solar system components (Sun, planets, minor planets, comets, asteroids)
- Distinguish between planets, moons, and artificial satellites
- Explain how gravity provides the force for circular orbits, leading to constant speed but changing velocity
- Describe qualitatively how orbital speed depends on the radius of the orbit and the mass of the central object
- Explain the formation of the Sun from dust and gas via gravity
- Describe the equilibrium in stars between gravitational collapse and expansion due to fusion energy
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