AQA AS Physics C11 Material Kerboodle Answers

This page contains the AQA AS Physics P11 Material Kerboodle Answers for revision and understanding of  Material. This page also contains the link to the notes and video for the revision of this topic. 

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C11.1 Density AQA AS Physics P11 Materials Kerboodle Answers: Page No. 185

1.Ans- a its volume, 8.0 x 10-4 m3 b its density. 3.1 x 103 kgm-3 2.ANS- a the mass, 6.3kg b the volume, 2.0x 10-3 m3 c the density of the paint in the tin. 3.1×103 kgm-3 3.Ans- a its volume in rn3, 9.6 x 10-6 m3 b its mass in kg. The density of steel = 7800 kg m-3 7.5 x 10-2 kg 4.Ans- a the mass of i aluminium, 0.29kg ii magnesium in the tube, 0.12kg b the density of the alloy. The density of aluminium = 2700 kg m-3 The density of magnesium = 1700 kg m-3 2.3 x 103 kg m-3

11.2 Springs AQA AS Physics P11 Materials Kerboodle Answers: Page No. 188

1. a the extension of the spring when the tension in it is equal to ION 0.40m b the tension in the spring when it is extended by 0.50m from its unstretched length. 12.5N 2.a the tension in each spring 20N b the extension of each spring 100mm c the spring constant of each spring. 200Nm-1 3.a 40N b for the two springs in series and vertical. 200mm 4.a the spring constant 12.3Nm-1 b the energy stored in the spring 8.8 x 10-2 J c the weight that needs to be added to extend the spring to 600 mm. 2.2 N

11.3 Deformation of solids AQA AS Physics P11 Materials Kerboodle Answers: Page No. 191

1.1.0 x 109 Pa 2. 1.3 x 1011 Pa 3.a the tensile stress in the wire 9.4 x 108 Pa b the extension of the wire. The Young modulus of steel 2.1 x 1011 Pa. 1.1 x 10-2m

11.4 More about stress and strain AQA AS Physics P11 Materials Kerboodle Answers : Page No. 193

1.a the tensile stress in the cable, 3.3 x 106 Pa b the extension of the cable, 2.8 x 10-4 m c the elastic energy stored in the cable, assuming its elastic limit has not been reached. 0.21 J 2. 2.3mm b the elastic energy stored in the wire. 1.7 x 10-2 J 3. a the compressive force exerted on the bar, 470kN b the work done to Compress it. 47J 4. a the work done to stretch the rubber band to an extension of 0.40 m, 10.0J b the internal energy retained by the rubber band when it unstretched. 4.2J Banner 8

Practice questions: Page No. 194-195

1. (a) The density of a material is the mass per unit volume (b) Density of copper 8.9 x 103 kg m-3 Density of zinc 7.1 x 103 kg m-3 (i) Volume of copper = 0.70 × 0.80 × 10-3 = 0.56 × 10-3 m3 Mass of copper = ρCVC = 8.9 × 103 × 0.56 × 10-3 = 5.0 kg Mass of zinc = ρZVZ = 7.1 × 103 × 0.30 × 0.80 × 10-3 = 1.7 kg (ii) Force applied to spring = weight of lorry = mg = 1.2 × 103 × 9.81 = 1.18 × 104 N 3 (a) (i) Material X obeys Hooke’s law until it fractures because stress is proportional to strain over the whole line (ii) is the weaker material Y is the weaker material because its breaking stress is lower than that of X (iii) is ductile material Y is ductile because it exhibits plastic behaviour (iv) has the greater elastic strain energy for a given tensile stress (8 marks) Material Y has the greater strain energy for a given tensile stress because the area under its graph is greater for a given tensile stress (b) (i) cross-sectional area = 0.64 mm2 = 0.64 × 10−6 m2 (ii)Energy stored in cord 4. (a)Graph plotted to include: • At least 9 points plotted correctly • All 12 points plotted correctly • correct graph for increasing loads, linear up to about 80 N and with curved part for higher loads >80 N • Correct linear graph for decreasing loads, with permanent extension for zero load (b).Relevant points include: • Initially the wire obeys Hooke’s law (or behaves elastically) • This continues up to the limit of proportionality • The elastic limit is reached beyond the limit of proportionality • The wire then undergoes plastic deformation • Which produces a permanent extension • Extension varies linearly with load as the load is decreased (c). 5. (i) (ii) (iii) The cross-seasonal area 01 each wire is I .4 x 10*’ and the unstretched length is 1.5 m. Determine the extension produced in either wire. (3 marks) AQA, 2005 Banner 9

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