Physics Annual Examinations For Secondary Schools Form 5 - Directorate For Quality And Standards In Education, 2012 Page 9
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12Graph of velocity v in m/s against time t in s
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10.
This question is about
D
B
C
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motion and momentum.
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The velocity/time graph
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shows part of Claudia’s
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car journey from the
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hospital to home.
v (m/s)
6
4
2
0
A
0
1
2
3
4
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10 11 12
t (s)
a.
Describe Claudia’s motion between:
i.
A and B ____________________
ii.
B and C ___________________________
(2)
b.
Point C on the graph shows the point at which Claudia sees the traffic lights turn orange. She
applies the brakes with a constant force F. Her reaction time is 1s.
i.
Explain the term ‘reaction time’.
________________________________________________________________________________
(2)
ii.
The reaction time of a young healthy person is approximately 0.7 s. Give one reason
why Claudia’s reaction time was actually longer.
________________________________________________________________________________
(1)
c.
Claudia’s car decelerates uniformly for 4 s coming to a stop as the traffic lights turn red.
Complete the graph to show Claudia’s velocity during braking time.
(2)
d.
Calculate the:
i.
distance covered during reaction time (from C to D),
________________________________________________________________________________
(2)
ii.
braking distance,
________________________________________________________________________________
(2)
iii.
total stopping distance.
________________________________________________________________________________
(1)
e.
The total mass of Claudia and her car is 1000 kg. Use the graph to find the:
i.
total momentum of the car and its driver at A,
________________________________________________________________________________
(2)
ii.
total momentum of the car and its driver at B,
________________________________________________________________________________
(2)
iii.
resultant force acting on the car during deceleration.
________________________________________________________________________________
_____________________________________________________________________________ (4)
Physics – Secondary Schools – Track 3 - Form 5 – 2012
Page 9 of 12
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