Circular Motion 0625 - w01 - QP - 3-2
Circular Motion 0625 - w01 - QP - 3-2
Circular Motion 0625 - w01 - QP - 3-2
Examiner’s
Use
1 Fig. 1.1 shows the motion of a train over a section of track which includes a sharp bend.
30
25
20
speed
––––– 15
m/s
10
0
0 10 20 30
time/s
Fig. 1.1
(a) The section of the track with the sharp bend has a maximum speed restriction. The train
decelerates approaching the bend so that at the start of the bend it has just reached the
maximum speed allowed. The train is driven around the bend at the maximum speed
allowed and accelerates immediately on leaving the bend.
(i) What is the maximum speed allowed round the bend in the track?
(ii) How long does the train take to travel the bend of the track?
(b) The train has to slow down to go round the bend. Calculate the deceleration.
deceleration = .....................................[2]
0625/3/O/N/01
3 For
Examiner’s
Use
(c) As the train is driven round the bend, there is an extra force acting, called the centripetal
force.
(i) On Fig. 1.2, draw an arrow to show the direction of this force.
train
curved
track
direction
of motion
Fig. 1.2
(ii) State the effect that this force has on the motion.
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[3]