Oxford AQA IGCSE · Physics (9203)

Solar system and orbital motion: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Solar system and orbital motion.

10 questions26 marksFree, no account

Question 1

1 mark

A planet is in a stable circular orbit around a star. What is the primary role of the gravitational force in this system?

Question 2

1 mark

A scientist is calculating the required orbital speed for a new artificial satellite. Which of the following factors will not affect the speed required for a stable circular orbit at a specific radius \( r \)?

Question 3

1 mark

Which of the following correctly describes the main components of our solar system as defined in current scientific models?

Question 4

1 mark

Compare a satellite in a geostationary orbit with a satellite in a low polar orbit. Which statement correctly describes their motion?

Question 5

1 mark

If an artificial satellite is moved from a low circular orbit to a higher circular orbit further from the Earth, how does its stable orbital speed change?

Question 6

3 marks

Compare the orbital speed of a satellite in a low Earth orbit with a satellite in a high geostationary orbit, and identify the force that determines this difference.

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Question 7

5 marks

Using the concept of centripetal force, explain how the force of gravity maintains the orbital motion of a moon without causing it to crash into the planet it orbits.

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Question 8

3 marks

Explain why a planet orbiting the Sun is considered to be constantly accelerating, even if it maintains a constant orbital speed.

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Question 9

4 marks

Artificial satellites are placed in orbit around the Earth to facilitate communications and scientific research.

Explain how the orbital radius of a satellite must change if its orbital speed is increased to maintain a stable circular orbit. In your answer, refer to the role of gravity as a centripetal force.

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Question 10

6 marks

The solar system consists of many objects with different types of motion.

a) Compare the orbital paths of a planet and a comet orbiting the Sun.
b) Explain how gravity provides the centripetal force required to keep a planet in orbit, and describe how this force affects the planet's velocity and speed.

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