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A-level 2025 AQA A-LEVEL PHYSICS Paper 3 Section B
PHYSICS
Engineering Physics Question Paper & Mark
Scheme (Merged) Tuesday 17 June 2025
[VERIFIED]
Paper 3
Section B Engineering physics
Tuesday 17 June 2025 Morning
Materials Time allowed: The total time for
For this paper you must have: both sections of this paper is
a pencil and a ruler
a scientific calculator 2 hours. You are advised to
a Data and Formulae Booklet spend approximately
a protractor. 50 minutes on this section.
Instructions
Use black ink or black ball-point pen.
Fill in the boxes at the top of this page. For Examiner’s Use
Answer all questions. Question Mark
You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages. 1
If you need extra space for your answer(s), use the lined pages at the end of 2
this book. Write the question number against your answer(s). 3
Do all rough work in this book. Cross through any work you do not want
4
to be marked.
Show all your working. TOTAL
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
7 408/3BC
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IB/M/Jun25/G4006/E7
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 The rotating part of an electric motor is called the rotor.
Figure 1 shows an end view of a rotor turning clockwise due to a driving torque from
the motor. In this question, the clockwise direction is treated as positive.
Figure 1 Figure 2
The rotor can be brought to rest rapidly by reversing the electrical supply connections
to the motor. Figure 2 shows the rotor at time t = 0 when the supply connections are
reversed.
The rotor then slows down due to a constant anticlockwise retarding torque so that it
stops at time t = t1.
The angular velocity of the rotor at t = 0 is 98.0 rad s−1 clockwise.
The applied torque on the rotor at t = 0 is anticlockwise.
The applied torque produces a constant angular acceleration of −303 rad s−2.
Friction torque is negligible.
0 1 . 1 Determine t1.
[2 marks]
t1 = s
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box
The electrical supply remains connected and the rotor now accelerates uniformly
anticlockwise with an acceleration of magnitude 303 rad s−2.
At a later time t = t2, the angular velocity of the rotor is −120 rad s−1.
0 1 . 2 Determine the number of anticlockwise revolutions made by the rotor between
t1 and t2.
[2 marks]
number of revolutions =
0 1 . 3 The moment of inertia of the rotor about the axis of rotation is 9.60 × 10−2 kg m2.
Calculate the angular impulse on the rotor between t = 0 and t2.
[1 mark]
angular impulse = Nms
Question 1 continues on the next page
Turn over ►
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, 4
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0 1 . 4 Another way of quickly stopping the motor is to use a disc brake. The motor is
brought to rest by switching off the power supply and then forcing two brake pads
against the disc.
Figure 3 shows the two brake pads each applying a constant retarding force of 182 N
to the disc.
Figure 3
moment of inertia of rotor and disc about the axis of rotation = 0.101 kg m2
diameter of disc = 0.160 m
diameter of pad = 22 mm
Compare the angular deceleration produced by the disc brake system with the
angular deceleration produced by reversing the electrical connections.
[3 marks]
8
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IB/M/Jun25/7408/3BC
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level 2025 AQA A-LEVEL PHYSICS Paper 3 Section B
PHYSICS
Engineering Physics Question Paper & Mark
Scheme (Merged) Tuesday 17 June 2025
[VERIFIED]
Paper 3
Section B Engineering physics
Tuesday 17 June 2025 Morning
Materials Time allowed: The total time for
For this paper you must have: both sections of this paper is
a pencil and a ruler
a scientific calculator 2 hours. You are advised to
a Data and Formulae Booklet spend approximately
a protractor. 50 minutes on this section.
Instructions
Use black ink or black ball-point pen.
Fill in the boxes at the top of this page. For Examiner’s Use
Answer all questions. Question Mark
You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages. 1
If you need extra space for your answer(s), use the lined pages at the end of 2
this book. Write the question number against your answer(s). 3
Do all rough work in this book. Cross through any work you do not want
4
to be marked.
Show all your working. TOTAL
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
7 408/3BC
for more : tyrionpapers.com
IB/M/Jun25/G4006/E7
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 The rotating part of an electric motor is called the rotor.
Figure 1 shows an end view of a rotor turning clockwise due to a driving torque from
the motor. In this question, the clockwise direction is treated as positive.
Figure 1 Figure 2
The rotor can be brought to rest rapidly by reversing the electrical supply connections
to the motor. Figure 2 shows the rotor at time t = 0 when the supply connections are
reversed.
The rotor then slows down due to a constant anticlockwise retarding torque so that it
stops at time t = t1.
The angular velocity of the rotor at t = 0 is 98.0 rad s−1 clockwise.
The applied torque on the rotor at t = 0 is anticlockwise.
The applied torque produces a constant angular acceleration of −303 rad s−2.
Friction torque is negligible.
0 1 . 1 Determine t1.
[2 marks]
t1 = s
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IB/M/Jun25/7408/3BC
, 3
Do not write
outside the
box
The electrical supply remains connected and the rotor now accelerates uniformly
anticlockwise with an acceleration of magnitude 303 rad s−2.
At a later time t = t2, the angular velocity of the rotor is −120 rad s−1.
0 1 . 2 Determine the number of anticlockwise revolutions made by the rotor between
t1 and t2.
[2 marks]
number of revolutions =
0 1 . 3 The moment of inertia of the rotor about the axis of rotation is 9.60 × 10−2 kg m2.
Calculate the angular impulse on the rotor between t = 0 and t2.
[1 mark]
angular impulse = Nms
Question 1 continues on the next page
Turn over ►
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IB/M/Jun25/7408/3BC
, 4
Do not write
outside the
box
0 1 . 4 Another way of quickly stopping the motor is to use a disc brake. The motor is
brought to rest by switching off the power supply and then forcing two brake pads
against the disc.
Figure 3 shows the two brake pads each applying a constant retarding force of 182 N
to the disc.
Figure 3
moment of inertia of rotor and disc about the axis of rotation = 0.101 kg m2
diameter of disc = 0.160 m
diameter of pad = 22 mm
Compare the angular deceleration produced by the disc brake system with the
angular deceleration produced by reversing the electrical connections.
[3 marks]
8
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IB/M/Jun25/7408/3BC
