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1 Centre Number Surname Candidate Signature Candidate Number Other Names Notice to Candidate. The work ou submit for assessment must be our own. If ou cop from someone else or allow another candidate to cop from ou, or if ou cheat in an other wa, ou ma be disqualified. Candidate Declaration. I have read and understood the Notice to Candidate and can confirm that I have produced the attached work without assistance other than that which is acceptable under the scheme of assessment. Date For Teacher s Use Section Mark PSA Stage 1 Section A Section B General Certificate of Education Advanced Subsidiar Examination June 2013 TOTAL (max 50) Phsics (Specification A & B) PHY3T/P13/test Unit 3T AS Investigative Skills Assignment (ISA) P For submission b 15 Ma 2013 For this paper ou must have: l our documentation from Stage 1 l a ruler with millimetre measurement l a calculator. Instructions: l Use black ink or black ball-point pen. l Fill in the es at the top of this page. l Answer all questions. l You must answer the questions in the space provided. Do not write around each page or on blank pages. l Do all rough work in this book. Cross through an work ou do not want to be marked. l Show all our working. Time allowed l 1 hour Information l The marks for questions are shown in brackets. l The maximum mark for this paper and Stage 1 is 41. Details of additional assistance (if an). Did the candidate receive an help or information in the production of this work? If ou answer es give the details below or on a separate page. Yes No Teacher Declaration: I confirm that the candidateʼs work was conducted under the conditions laid out b the specification. I have authenticated the candidateʼs work and am satisfied that to the best of m knowledge the work produced is solel that of the candidate. Signature of teacher... Date... As part of AQA s commitment to assist students, AQA ma make our coursework available on a strictl anonmous basis to teachers, examining staff and students in paper form or electronicall, through the Internet or other means, for the purpose of indicating a tpical mark or for other educational purposes. In the unlikel event that our coursework is made available for the purposes stated above, ou ma object to this at an time and we will remove the work on reasonable notice. If ou have an concerns please contact AQA. To see how AQA complies with the Data Protection Act 1988 please see our Privac Statement at aqa.org.uk PHY3T/P13/test

2 2 Section A Answer all questions in the spaces provided. You should refer to our documentation from stage 1 as necessar. 1 (a) Theor predicts that the equation for the straight line ou drew in Stage 1 is where A and B are positive constants. L = A( ) + B 1 (a) (i) With reference to our graph, discuss whether our results support the theor. 1 (a) (ii) With reference to our graph, comment on the reliabilit of our data. 1 (a) (iii) Use our graph to find a value for B. M θm cos( ) 1 (a) (iv) Identif the phsical quantit represented b B. 2

3 3 1 (b) (i) Use data from the table to estimate the uncertaint in L for M = 100 g. 1 (b) (ii) Use data from the table to estimate the uncertaint in θ m for M = 100 g. 1 (b) (iii) For M = 100 g, state which of the measured quantities in parts (b)(i) and (b)(ii) has the greater percentage uncertaint. Show our working. 1 (b) (iv) Without further calculation, state and explain whether our answer to part (b)(iii) would be the same for M = 700 g. (3 marks) 12 Turn over

4 4 Section B Answer all the questions in the spaces provided. 2 In an experiment similar to the one ou performed in Stage 1 an unknown load, of weight, W, was supported b two springs kept in tension b equal masses, m, hung from their free ends, with each string passing over a frictionless pulle. The arrangement was smmetrical and is shown in Figure 1. Figure 1 x W m m The distance x was kept constant throughout the experiment. The length was measured for different values of m. The results are shown in the table. The distance between the strings at the pulles, x = m m /kg / m ( ) x ( )2 x

5 5 2 (a) Figure 2 shows the three forces acting through the point at which the strings are attached to the load. The weight of the load is W and the tension in each string is mg, where g is gravitational field strength. Figure 2 mg mg φ φ W W 2 (a) (i) B resolving the forces verticall show that m = 2gcosφ where φ is the angle between each string and the vertical. 2 (a) (ii) Complete the table on page 4. 2 (a) (iii) Complete the graph on the following page b plotting the missing two points and drawing a straight line of best fit. Turn over

6 6 m/kg ( )2 x

7 7 2 (b) (i) Determine the gradient of our graph. (3 marks) 2 (b) (ii) The equation for the straight line is m = W 1 g 4 ( )2 x Given that g = 9.81 N kg 1, determine a value for W. 2 (c) The uncertaint in the measurement of x was ±1 mm and the uncertaint in the measurement of was ±2 mm. Calculate the percentage uncertaint in ( ) x 2 for m = kg. (3 marks) Turn over

8 8 2 (d) (i) Explain the term sstematic error. 2 (d) (ii) There ma be a sstematic error in this experiment because of friction in the pulles. When the measurements were taken, increasing values of m were used. State and explain how friction in the pulles would have affected the measured values of. 16

9 9 3 Figure 3 shows another sstem where three forces are in equilibrium. reaction force Figure 3 frictional force ramp W θ hinge A wooden is at rest on a ramp at an angle θ to the horizontal. W is the weight of the and its contents. The frictional force prevents the sliding down the ramp. The reaction force acts on the as shown. The ramp is hinged at its lower end so that it can be easil lifted to change the angle θ. Describe how ou would investigate the relationship between W and the angle, θ s, at which the just starts to slide down the ramp.

10 10 (5 marks) 5 END OF QUESTIONS Copright 2013 AQA and its licensors. All rights reserved.