Physics Worksheet - Secondary Schools - Directorate For Quality And Standards Education Page 10

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7. Our solar system can be found in one
of the billion galaxies that exist in our
Universe.
The diagram shows our
solar system.
a) Give the name of our galaxy.
_____________________________
[1]
b) The planets in our solar system
orbit the Sun. Explain the meaning
of the term ‘orbit’.
___________________________________________________________________________
[1]
c) Briefly describe the difference between light coming from one of the planets and that
coming from a star.
_____________________________________________________________________________
___________________________________________________________________________
[2]
d) Give ONE other difference between a planet and a star.
___________________________________________________________________________
[1]
e) What force keeps the planets orbiting the Sun?
___________________________________________________________________________
[1]
f) How does the force mentioned in part (e) change with increasing distance from the Sun?
___________________________________________________________________________
[1]
g) The table below shows data about some of the planets making up the solar system.
Mass (  10
Planet
24
kg)
Time to spin once on its own axis
Time to complete one orbit
(hours)
around the Sun (days)
Venus
4.87
5832
225
Earth
5.97
24
365
Saturn
568
11
10747
Uranus
86.8
17
30589
Neptune
102
16
59800
Page 10 of 12
Physics – Form 3 Secondary – Track 3 – 2015

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