Physics Worksheet - Annual Examinations For Secondary Schools, 2015 Page 3
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123. The Andromeda galaxy is 2.5 million light years away from Earth.
a) Name the instrument used to observe such a distant galaxy.
______________________________________________________________[1]
b) What is a galaxy made up of?
Figure 3
_______________________________________________________________________________ [1]
c) Define the term light year.
_______________________________________________________________________________ [2]
8
d) Change 1 light year to metres. The speed of light is 3×10
m/s.
__________________________________________________________________________________
_______________________________________________________________________________ [3]
e) Name one benefit of space exploration.
_______________________________________________________________________________ [1]
f) Name one question about the Universe that is still unanswered to this day.
_______________________________________________________________________________ [2]
dog
4. Tony is driving his car at a speed of
sees dog
car stops
starts braking
20 m/s. He sees a dog sitting in the
Figure 4
middle of the road 75 m ahead. The car moves a distance of 12 m before he starts to apply the brakes.
He eventually manages to stop the car 6 seconds after braking.
a) Calculate his reaction (thinking) time.
_______________________________________________________________________________ [1]
b) Calculate his braking distance.
_______________________________________________________________________________ [2]
c) Work out the total stopping distance.
_______________________________________________________________________________ [1]
d) Using the answer in part ‘c’, state whether he will hit the dog.___________________________ [1]
e) Find the deceleration of the car.
_______________________________________________________________________________ [2]
f) Given that the mass of the car is 1500 kg, determine the braking force needed to stop the car.
__________________________________________________________________________________
_______________________________________________________________________________ [2]
g) Tony accelerates to 30 m/s. His reaction time (increases, decreases, remains the same).
[1]
Physics – Form 5 Secondary – Track 2 – 2015
Page 3 of 12
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