AQA AS PHYSICS BEST RATING Paper 2 May 2023

AQA AS PHYSICS Paper 2 Wednesday 24 May 2023 Afternoon Materials For this paper you must have: • a pencil and a ruler • a scientific calculator • a Data and Formulae Booklet • a protractor. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. Time allowed: 1 hour 30 minutes You are advised to spend about 35 minutes on Section C • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • 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). • 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 70. • You are expected to use a scientific calculator where appropriate. • A Data and Formulae Booklet is provided as a loose insert. Section A Answer all questions in this section. outside the box 0 1 . 1 Figure 1 shows a micrometer screw gauge. Figure 1 What is the reading on the micrometer? Tick () one box. [1 mark] 6.25 6.75 7.25 8.25 . A metal wire of diameter d is held in the gap between the anvil and the spindle. Just before the reading of d is taken, the gap is closed using the ratchet and not the thimble. box Explain why the gap is closed in this way. [1 mark] . The mass per unit length μ of the metal wire is given by ρd 2 μ= 4 where ρ is the density of the metal. Values of d and μ are used to calculate ρ. The percentage uncertainty in d is 1.2%. The percentage uncertainty in μ is 2.0%. Calculate the percentage uncertainty in the result for ρ. [2 marks] percentage uncertainty = % Question 1 continues on the next page Turn over ► Figure 2 shows apparatus used to investigate how the frequency of stationary waves on a wire depends on its diameter d. Figure 2 When the signal generator is switched on, the horizontal part of the wire oscillates. A student changes the frequency until the first-harmonic stationary wave is produced. The student records the frequency f of the first harmonic and then turns off the signal generator. She removes the wire and measures d using a micrometer. She then repeats the experiment for wires of different diameter. 0 1 . 4 The wires used in the experiment are made of the same metal so that ρ is a control variable. State two other control variables in the experiment. [2 marks] 1 2 Figure 3 is a plot of the experimental data. Figure 3 0 1 . 5 The student suggests that f  1 . d Deduce, using data points from Figure 3, whether this suggestion is correct. [2 marks] Question 1 continues on the next page Turn over ► . Another student repeats the experiment with the mass of M doubled. Explain how this student’s plotted data compare with Figure 3. [2 marks] box box *07* Turn over ► . A ruler, graduated in mm, is used to determine x. The student places the ruler on the floor with the zero graduation aligned with P. The student determines x when the ball is released six times at a particular value of h. He makes marks on the floor where the ball lands. Figure 5 shows circles that indicate these marks. Figure 5 box Determine x for this value of h. [3 marks] x = mm . The student obtains values of x corresponding to other values of h. Figure 6 shows his results. Figure 6 box It can be shown that x2 20 h H 7 Determine H. [3 marks] H = m Question 2 continues on the next page Turn over ► In a different arrangement, the ball is released from rest and then continues to roll at a constant velocity across a horizontal table, as shown in Figure 7. Figure 7 The bottom of the track is fixed to the table at point Q. The angle between the straight part of the track and the table is α. A marker is placed at R, a point midway between Q and the edge of the table. The student uses a stopwatch to measure the time t for the ball to roll from Q to R. 0 2 . 4 Explain why increasing the distance QR will reduce the percentage uncertainty in t. [1 mark] 0 2 . 5 Figure 8 shows values of t for different values of α. Figure 8 At a particular value of α the ball rolls from Q to R at its maximum velocity. Explain how the student should use Figure 8 to determine this value of α. Go on to suggest what further readings should be taken to reduce the uncertainty in this value of α. [2 marks] END OF SECTION A Turn over ►