Welcome to your Deformation of Solids - Hookes Law and Youngs Modulus(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Which object behaves as an elastic solid as it deforms? A bullet as it hits a solid metal wall A car damaged in a collision A football as it is kicked A piece of metal cut by a saw 2. A metal wire, of initial length 1000mm, extends by 4mm when a load of 2N is added to it. What is the length of the wire when a further 3 N is added, assuming that the wire does not extend beyond the limit of proportionality? 1010mm 1006mm 1012mm 1008mm 3. What is atomic density on prismatic plane? 2/√3a² 2/ac 1/a² 2/a² 4. Elastic modulus can’t be changed by ______ alloying heat treatment cold working by increasing section thickness 5. A spring has a length of 9 cm when loaded with a 200 g mass. The extension-mass graph for the spring is shown. The 200g mass is replaced with a 100g mass. What is the new length of the spring? 9 cm 7 cm 10cm 8cm 6. Molecules of a solid possess Rotatory motion Translational motion Polymeric structure Ideal arrangement 7. The diagram shows how the length of a spring changes when a load of 10N is hung on it. The 10N load is replaced by a 20N load. What is the new length of the spring? 14cm 16cm 6 cm 11cm 8. The table shows how the extension of a spring varies with load. Between which two loads would you find the limit of proportionality? 0N and 2N 14N and 16N 8N and 10N 10N and 12N 9. The yellow line indicates which of the following? Pre-fracture stress load Strength of ductility Modulus of elasticity 10. A load L is suspended from two springs that are in parallel. The extension of each spring is x. In this new arrangement, what is the total extension of the two springs? 4x 1/2 of x 2x x 11. _____ is an anisotropic property of a crystal. Poisson's ratio Damping Elastic modulus Density 12. Which property of a body cannot be changed if a force is applied to it? Its shape Its size Its mass Its velocity 13. A 100 g mass is suspended from a spring next to a vertical metre rule. The top of the spring is level with the 0.0cm mark. The bottom of the spring is level with the 27.2cm mark. The 100g mass is replaced with a 600g mass. The length of the spring is now 89.7cm. The spring has not reached the limit of proportionality. The 600g mass is replaced with a 200g mass. What is the length of the spring? 54.4cm 39.7cm 29.9cm 33.4cm 14. A spring balance is calibrated to give readings in newtons. The graph shows how the length of the spring varies with the load. A load causes the spring of the balance to extend by 3cm. What is the balance reading? 3N 5N 10N 15N 15. A crystalline solid has low KE only vibrational energy Rotational energy an ordered structure 16. Strain is the ratio of Force x area Force/Length Force / Area Change in Length/Original length 17. An extension-load graph is plotted to show the result of increasing the load on a spring. Which point marks the limit of proportionality for this spring? B A C D 18. The graph shows extension-load curves for four fibres. Which fibre is the hardest(most difficult) to stretch over the range of loads shown? A B D C 19. Force per unit area that results from a load applied to the material defines Young's modulus Strain Stress Yield 20. The negative ratio between the lateral strain and the direct tensile strain is known as ______ Poisson’s ratio Elastic modulus True strain Engineering strain 21. By altering composition or heat treatment, elastic modulus can be increased to very high orders. False True 22. SI unit of stress is N x m Dynes m^-1 N-m^-2 N 23. Force applied on a unit area of a crystal is called elasticity Stress Flexibility strain 24. The graph shows the extension of a piece of copper wire as the load on it is increased. What does the graph show? The load and extension are inversely proportional for all loads. At a certain load the wire becomes harder to extend. The load and extension are directly proportional for all loads. At a certain load the wire becomes easier to extend. 25. A steel spring is stretched by a load. The load is increased. At first the extension is proportional to the load. The spring reaches its limit of proportionality at L. Which is the correct graph of the extension against load for the spring? B D C A 1 out of 25 Time is Up! Time's up
