![1 A large plastic ball is dropped from the top of a tall building.
Fig. 1.1 shows the speed-time graph for the falling ball until it hits the ground.
000 1000 10 1
20
15
10
5
0
time/s
speed
m/s
Fig. 1.1
(a) From the graph estimate,
(i) the time during which the ball is travelling with terminal velocity,
time = ................................................ [1]
(ii) the time during which the ball is accelerating,
time = ................................................ [1]
(iii) the distance fallen while the ball is travelling with terminal velocity,
distance = ................................................ [2]
(iv) the height of the building.
height = ................................................ [2]
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![(b) Explain, in terms of the forces acting on the ball, why
(i) the acceleration of the ball decreases,
..................................................................................................................................
..................................................................................................................................
..................................................................................................................................
............................................................................................................................ [3]
(ii) the ball reaches terminal velocity.
..................................................................................................................................
............................................................................................................................ [2]
[Total: 11]
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![2 A solid plastic sphere falls towards the Earth.
Fig. 1.1 is the speed-time graph of the fall up to the point where the sphere hits the Earth’s
surface.
Fig. 1.1
(a) Describe in detail the motion of the sphere shown by the graph.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..................................................................................................................................... [3]
0
20
P
Q
R S T
40
60
80
100
120
140
speed
m/s
100 20 30 40 05 60 70 08 90 100 110
time/s
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![(b) On Fig. 1.2, draw arrows to show the directions of the forces acting on the sphere when
it is at the position shown by point S on the graph. Label your arrows with the names of
the forces. [2]
Fig. 1.2
(c) Explain why the sphere is moving with constant speed at S.
..........................................................................................................................................
..........................................................................................................................................
..................................................................................................................................... [2]
(d) Use the graph to calculate the approximate distance that the sphere falls
(i) between R and T,
distance = ………………. [2]
(ii) between P and Q.
distance = ………………. [2]
[ Total : 11 ]
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![3 Fig. 2.1 shows a simple pendulum that swings backwards and forwards between P and Q.
pendulum bob
Fig. 2.1
(a) The time taken for the pendulum to swing from P to Q is approximately 0.5 s.
Describe how you would determine this time as accurately as possible.
..........................................................................................................................................
..........................................................................................................................................
..................................................................................................................................... [2]
(b) (i) State the two vertical forces acting on the pendulum bob when it is at position R.
1.. .......................................................................................................................... ...
2.. ........................................................................................................................ [1]
(ii) The pendulum bob moves along the arc of a circle. State the direction of the
resultant of the two forces in (i).
.............................................................................................................................. [1]
(c) The mass of the bob is 0.2 kg. During the swing it moves so that P is 0.05 m higher
than R.
Calculate the increase in potential energy of the pendulum bob between R and P.
potential energy = ………………. [2]
support
string
P
R
Q
[ Total : 6]
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![4 (a) State what is meant by the terms
(i) weight, ......................................................................................................................
.............................................................................................................................. [1]
(ii) density. ......................................................................................................................
.............................................................................................................................. [1]
(b) A student is given a spring balance that has a scale in newtons. The student is told that
the acceleration of free-fall is 10 m/s2.
(i) Describe how the student could find the mass of an irregular solid object.
...................................................................................................................................
...................................................................................................................................
.............................................................................................................................. [2]
(ii) Describe how the student could go on to find the density of the object.
...................................................................................................................................
...................................................................................................................................
...................................................................................................................................
.............................................................................................................................. [2]
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![(c) Fig. 1.1 shows three forces acting on an object of mass 0.5 kg. All three forces act
through the centre of mass of the object.
Fig. 1.1
Calculate
(i) the magnitude and direction of the resultant force on the object,
magnitude = ……………… direction .............................................................. [2]
(ii) the magnitude of the acceleration of the object.
acceleration =…………………… [2]
4.0N
9.0N 3.0N
centre of mass
[ Total : 10 ]
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![5 Fig. 1.1 shows the speed-time graph for a bus during tests.
At time t = 0, the driver starts to brake.
Fig. 1.1
(a) For test 1,
(i) determine how long the bus takes to stop,
..................................................................................................................................
(ii) state which part of the graph shows the greatest deceleration,
..................................................................................................................................
(iii) use the graph to determine how far the bus travels in the first 2 seconds.
distance = ..........................................
[4]
1086420 975
P
Q
R
31
0
10
20speed
time t/s
m/s
5
15
esttesttestt
ttest 1est 1
(b) For test 2, a device was fitted to the bus. The device changed the deceleration.
(i) State two ways in which the deceleration during test 2 is different from that during
test 1.
1 ...............................................................................................................................
2 ...............................................................................................................................
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![(ii) Calculate the value of the deceleration in test 2.
deceleration = ....................................
[4]
(c) Fig. 1.2 shows a sketch graph of the magnitude of the acceleration for the bus when it
is travelling around a circular track at constant speed.
Fig. 1.2
(i) Use the graph to show that there is a force of constant magnitude acting on the
bus.
..................................................................................................................................
..................................................................................................................................
(ii) State the direction of this force.
..................................................................................................................................
[3]
0
0
magnitude
of acceleration
time
[Total : 11]
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forces theory
- 1. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Forces Question Paper 7 Level IGCSE ExamBoard CIE Topic General Physics Sub-Topic Forces Paper Type (Extended) Theory Paper Booklet Question Paper 7 Time Allowed: 59 minutes Score: /49 Percentage: /100 Subject Physics
- 2. 1 A large plastic ball is dropped from the top of a tall building. Fig. 1.1 shows the speed-time graph for the falling ball until it hits the ground. 000 1000 10 1 20 15 10 5 0 time/s speed m/s Fig. 1.1 (a) From the graph estimate, (i) the time during which the ball is travelling with terminal velocity, time = ................................................ [1] (ii) the time during which the ball is accelerating, time = ................................................ [1] (iii) the distance fallen while the ball is travelling with terminal velocity, distance = ................................................ [2] (iv) the height of the building. height = ................................................ [2] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 3. (b) Explain, in terms of the forces acting on the ball, why (i) the acceleration of the ball decreases, .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. ............................................................................................................................ [3] (ii) the ball reaches terminal velocity. .................................................................................................................................. ............................................................................................................................ [2] [Total: 11] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 4. 2 A solid plastic sphere falls towards the Earth. Fig. 1.1 is the speed-time graph of the fall up to the point where the sphere hits the Earth’s surface. Fig. 1.1 (a) Describe in detail the motion of the sphere shown by the graph. .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ..................................................................................................................................... [3] 0 20 P Q R S T 40 60 80 100 120 140 speed m/s 100 20 30 40 05 60 70 08 90 100 110 time/s Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 5. (b) On Fig. 1.2, draw arrows to show the directions of the forces acting on the sphere when it is at the position shown by point S on the graph. Label your arrows with the names of the forces. [2] Fig. 1.2 (c) Explain why the sphere is moving with constant speed at S. .......................................................................................................................................... .......................................................................................................................................... ..................................................................................................................................... [2] (d) Use the graph to calculate the approximate distance that the sphere falls (i) between R and T, distance = ………………. [2] (ii) between P and Q. distance = ………………. [2] [ Total : 11 ] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 6. 3 Fig. 2.1 shows a simple pendulum that swings backwards and forwards between P and Q. pendulum bob Fig. 2.1 (a) The time taken for the pendulum to swing from P to Q is approximately 0.5 s. Describe how you would determine this time as accurately as possible. .......................................................................................................................................... .......................................................................................................................................... ..................................................................................................................................... [2] (b) (i) State the two vertical forces acting on the pendulum bob when it is at position R. 1.. .......................................................................................................................... ... 2.. ........................................................................................................................ [1] (ii) The pendulum bob moves along the arc of a circle. State the direction of the resultant of the two forces in (i). .............................................................................................................................. [1] (c) The mass of the bob is 0.2 kg. During the swing it moves so that P is 0.05 m higher than R. Calculate the increase in potential energy of the pendulum bob between R and P. potential energy = ………………. [2] support string P R Q [ Total : 6] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 7. 4 (a) State what is meant by the terms (i) weight, ...................................................................................................................... .............................................................................................................................. [1] (ii) density. ...................................................................................................................... .............................................................................................................................. [1] (b) A student is given a spring balance that has a scale in newtons. The student is told that the acceleration of free-fall is 10 m/s2. (i) Describe how the student could find the mass of an irregular solid object. ................................................................................................................................... ................................................................................................................................... .............................................................................................................................. [2] (ii) Describe how the student could go on to find the density of the object. ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... .............................................................................................................................. [2] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 8. (c) Fig. 1.1 shows three forces acting on an object of mass 0.5 kg. All three forces act through the centre of mass of the object. Fig. 1.1 Calculate (i) the magnitude and direction of the resultant force on the object, magnitude = ……………… direction .............................................................. [2] (ii) the magnitude of the acceleration of the object. acceleration =…………………… [2] 4.0N 9.0N 3.0N centre of mass [ Total : 10 ] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 9. 5 Fig. 1.1 shows the speed-time graph for a bus during tests. At time t = 0, the driver starts to brake. Fig. 1.1 (a) For test 1, (i) determine how long the bus takes to stop, .................................................................................................................................. (ii) state which part of the graph shows the greatest deceleration, .................................................................................................................................. (iii) use the graph to determine how far the bus travels in the first 2 seconds. distance = .......................................... [4] 1086420 975 P Q R 31 0 10 20speed time t/s m/s 5 15 esttesttestt ttest 1est 1 (b) For test 2, a device was fitted to the bus. The device changed the deceleration. (i) State two ways in which the deceleration during test 2 is different from that during test 1. 1 ............................................................................................................................... 2 ............................................................................................................................... Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
- 10. (ii) Calculate the value of the deceleration in test 2. deceleration = .................................... [4] (c) Fig. 1.2 shows a sketch graph of the magnitude of the acceleration for the bus when it is travelling around a circular track at constant speed. Fig. 1.2 (i) Use the graph to show that there is a force of constant magnitude acting on the bus. .................................................................................................................................. .................................................................................................................................. (ii) State the direction of this force. .................................................................................................................................. [3] 0 0 magnitude of acceleration time [Total : 11] Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/