Annual Examinations For Secondary Schools Physics Worksheet - 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.
14
12
The velocity/time graph
10
shows part of Claudia’s
8
car
journey
from
the
v (m/s)
6
hospital to home
4
.
2
0
A
0
1
2
3
4
5
6
7
8
9
10 11 12
t (s)
a.
Use the graph to answer the following:
i.
What is the car’s velocity after 2 s?
__________________
ii.
What is the maximum velocity of the car?
__________________
iii.
How long does the car take to travel from A to B?
__________________
(3)
b.
Describe the motion of the car between:
i.
A and B ______________________
ii.
B and C ______________________
(4)
c.
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)
d.
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)
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)
mv
-
mu
iii.
resultant force acting on the car during deceleration. (
Hint: Use the formula F =
)
t
________________________________________________________________________________
________________________________________________________________________________
_____________________________________________________________________________ (4)
Physics – Secondary Schools - Track 2 – Form 5 – 2012
Page 9 of 12
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