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Across 2. Unit of sound level 4. A material which undergoes very little plastic deformation before fracture 5. SI unit of frequency 8. The SI unit of temperature 12. The SI unit of force per unit area 13. The rate of energy transfer 14. The mass per unit volume of an object 16. The elastic modulus which determines the amount of bending or stretching of a material subjected to tensile stress 17. The laws governing planetary motion 19. The phenomenon of a system being caused to vibrate at its own natural frequency due to the vibrations of another source at the same frequency 22. A force which always opposes motion 25. The physical quantity defined as the product of mass and velocity 27. Time taken for a pendulum to complete a full cycle 28. SI unit of work and energy 30. Instrument used to measure temperature 33. The property of a wave bending through a medium of different density 34. The force of attraction that the earth has on an object 35. The change of phase from solid directly to gas 37. The phenomenon of liquids being able to rise up thin tubes placed in them 38. A name given to an object upon which the only force acting on it is earth's gravity 39. The change of phase form liquid to gas 41. Force required to keep object moving in circular path 42. The rate of change in displacement 43. SI unit of power 44. The reaction force of a incline on an object 45. The SI unit of electrical resistance 46. The property of a wave bending around an obstacle placed in its path 47. A physical quantity which the particle model describes as a measure of the average kinetic energy of the particles 48. Unstable fluid flow displaying a very high Reynolds number

Down 1. An element often used in semi-conductor devices 3. Scientist who formulated laws of relativistic mechanics 4. The upward force that a fluid exerts on a submerged object 5. The law stating that the displacement of an eleastic spring is proprtional to the resultant force acting on it 6. The cross product of position vector with applied force 7. A physical quantity expressed completely in terms of both magnitude and direction 9. The smallest negative charge 10. The physical property of fluids which affects their flow rate or the flow rate of solids through them 11. The type of energy a body possesses due to its state of linear motion 15. The work done to move a unit of charge between two points 18. Instrument used to measure pressure 20. An electronic device which allows output signals to be greater in amplitude than input signals 21. The type of force between unlike electric charges 23. A material which has a very high gradient in the elastic region of a stress strain graph 24. A method of heat tranfer through a gas 26. An object which is a perfect conductor and radiator of all heat on it 29. The physical property that allows some small insects to walk on top of liquids without sinking 30. The type of wave in which the disturbance in perpendicular to the direction of motion 31. Ratio of poer output to power input 32. The state a system is said to be in if the resultant force and torque on it is zero 36. A physical quantity represented by the gradient of a velocity vs time graph 40. For every action there is an equal and opposite reaction