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AQA-7408-3BC-PHYSICS QUESTION PAPER 3 SECTION B:Engineering physics-A LEVEL-17Jun24-AM

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AQA-7408-3BC-PHYSICS QUESTION PAPER 3 SECTION B:Engineering physics-A LEVEL-17Jun24-AM. 3 *03* Turn over ► IB/M/Jun24/7408/3BC Do not write outside the Section B box Answer all questions in this section. 0 1 A heavy turntable is mounted on a fixed base. The turntable can rotate freely on a low-friction bearing. 0 1 . 1 Figure 1 shows a propeller unit fixed to the centre of the turntable. The propeller unit consists of a motor-driven propeller and a battery. The propeller and the turntable have a common axis of rotation At first, the turntable and the propeller are at rest. The propeller motor is switched on and the propeller quickly reaches a high final angular speed. The propeller rotates clockwise when viewed from above. Compare, with reference to angular momentum, the motions of the turntable and the propeller. 0 1 box . 2 Figure 2 shows an arrangement used to determine the moment of inertia of the turntable. Figure 2 A small steel mass is held by an electromagnet above the top surface of the turntable. The diameter of the turntable is about half a metre. The turntable rotates freely at an initial angular speed ω1 . The switch is opened so that the mass falls and sticks to the surface of the turntable. This changes the angular speed of the turntable to ω2 . The steel mass can be considered to be a point mass. Describe how to determine the moment of inertia of the turntable using observations of ω1 and ω2 . In your answer you should: • suggest how ω1 and ω2 are measured • state any other measurements needed and name the equipment used to make them • explain how the moment of inertia of the turntable is determined from the measurements. [6 marks] 000004 Page 4 of 20

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A-level
PHYSICS

S
Paper 3
Section B Engineering physics
IC
Monday 17 June 2024 Morning Time allowed: The total time for
YS
both sections of this paper is
Materials
For this paper you must have: 2 hours. You are advised to
• a pencil and a ruler spend approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet
PH


• a protractor.
For Examiner’s Use
Instructions Question Mark
• Use black ink or black ball-point pen.
1
• Fill in the boxes at the top of this page.
• Answer all questions. 2
• You must answer the questions in the spaces provided. Do not write 3
outside the box around each page or on blank pages. 4
• If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). TOTAL
• Do all rough work in this book. Cross through any work you do not want
to be marked.
• Show all your working.

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.




IB/M/Jun24/E6 7408/3BC
Page 1 of 20

,000002

2
Do not write
outside the
There are no questions printed on this page box




S
IC
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
YS
PH




*02*
IB/M/Jun24/7408/3BC
Page 2 of 20

, 000003

3
Do not write
outside the
Section B box


Answer all questions in this section.


0 1 A heavy turntable is mounted on a fixed base. The turntable can rotate freely on a
low-friction bearing.

0 1 . 1 Figure 1 shows a propeller unit fixed to the centre of the turntable.
The propeller unit consists of a motor-driven propeller and a battery.
The propeller and the turntable have a common axis of rotation.

Figure 1




S
IC
At first, the turntable and the propeller are at rest.
The propeller motor is switched on and the propeller quickly reaches a high final
YS
angular speed.
The propeller rotates clockwise when viewed from above.

Compare, with reference to angular momentum, the motions of the turntable and the
propeller.
[3 marks]
PH




Question 1 continues on the next page

Turn over ►


*03*
IB/M/Jun24/7408/3BC
Page 3 of 20

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