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Motion in the universe

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Question 3

Planets and satellites move in orbits.

a.

Name the force that causes planets and satellites to remain in their orbits.

[1]
b.

The diagram below shows the orbits of a planet and a satellite in space.

A diagram showing a hierarchical orbital system, not to scale. At the center is a larger black circle with a label line pointing to it, marked (1). A large dashed circle represents its orbital path. On this path, there is a medium-sized black circle with a label line pointing to it, marked (2). Around this medium-sized circle is a smaller dashed circle representing another orbit. On this smaller orbit, there is a small black circle with a label line pointing to it, marked (3).

Identify the bodies labeled (1), (2), and (3) from the following list: Planet, Satellite, Star.

[3]
c.

Compare the orbital period (time period for one complete orbit) of the satellite around the planet to the orbital period of the planet around the star, explaining the reason for this difference.

[2]

Motion in the universe Questions

  1. IGCSE
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  3. /Motion in the universe