Igcse physics revision

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this is half of the physics syllabus of 2011.. this ppt is made for revision purposes.

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  • Igcse physics revision

    1. 1. Key points<br />Formulae<br />Physics IGCSE Revision(Part 1)<br />Simple<br />Easy<br />By: Momina<br />
    2. 2. Volume and Density<br />Mass<br />Density<br />=<br />Volume<br />m<br />=<br />Þ(rho)<br />V<br />
    3. 3. Volume and Density<br />How to find the volume of an irregular solid?<br />You need to fill up a measuring cylinder with water and measure till where it is filled.<br />Then lower the irregular solid into the measuring cylinder and measure how much the water has risen.<br />Subtracting the two values that you have will give you the volume of the substance.<br />
    4. 4. Speed<br /> Distance<br />Speed <br />=<br />Time<br />
    5. 5. Velocity<br /> Change in velocity<br />Average Acceleration <br />=<br />Time Taken<br />v-u<br />=<br />a<br />v= final velocity<br />u=initial velocity<br />Negative acceleration is called deceleration or retardation<br />t<br />
    6. 6. Forces<br />A force is a push or a pull.<br />Force is measure in Newton's (N).<br />If no external forces are applied to an object:<br /><ul><li>It will remain stationary
    7. 7. It will keep moving at a constant speed.</li></ul>What is Terminal Velocity?<br />It is when something is at its maximum speed.<br />
    8. 8. Forces<br />x<br />x<br />Mass<br />F <br />a<br />m<br />=<br />Acceleration<br />Force <br />=<br />
    9. 9. Friction<br />Friction is a force that stops two materials from sliding across each other.<br />Static Friction resists the lateral (sideways) movement of two objects.<br />Dynamic Friction is the friction between two objects that are moving. It heats up the material. When something is moved against the force of friction the kinetic energy is changed into thermal energy.<br />STATIC FRICTION IS GREATER THAN DYNAMIC FRICTION<br />
    10. 10. Gravitational Force<br />All the masses attract each other.<br />The greater the mass, the greater the force.<br />The closer the mass, the greater the force.<br />To every action there is an equal but opposite reaction.<br />
    11. 11. Gravitational Force<br />x<br />x<br />Mass<br />W <br />g<br />m<br />=<br />Gravity<br />Weight <br />=<br />
    12. 12. The Parallelogram Rule<br />1. First you need to draw the two lines given to you. The directions should be accurate and the length of each line should be in proportion to the magnitude of each vector.<br />2. Then draw in two more lines to complete the parallelogram.<br />3. Diagonal from ‘O’ and then measure its length.<br />
    13. 13. Centripetal Force<br />It is an inward force needed to make an object move in a circle.<br />More centripetal force is needed if:<br /><ul><li>Mass of the object is increased
    14. 14. Speed of the object is increased
    15. 15. Radius of the circle is increased.</li></li></ul><li>Moments<br />x<br />Moment of a force about a point<br />Perpendicular distance from the pivot<br />Force<br />=<br />The Principle of Moments<br /> Clockwise moments = Anticlockwise moments<br />
    16. 16. Hooke’s Law<br /> A material obeys Hooke’s law if, beneath the elastic limit, the extension is proportional to the load.<br />x<br />x<br />F <br />k<br />=<br />Extension<br />Spring Constant<br />Load <br />=<br />
    17. 17. Pressure<br /> Force<br />Pressure <br />=<br />Area<br />
    18. 18. Pressure in Liquids<br />Its in all directions<br />It increases with depth<br />It depends on the density of the liquid<br />It doesn’t depend on the shape of the container.<br />x<br />x<br />Gravity<br />=<br />Density<br />=<br />Pressure<br />pressure <br />x<br />Height<br />g<br />x<br />h<br />Þ(rho)<br />
    19. 19. Hydraulic Jack*<br />Output Piston area<br /> Output Force<br />=<br />Input Force<br />Input Piston area<br />
    20. 20. Pressure in Air<br />Pressure decreases as you rise through it.<br />It acts in all directions.<br />Barometer: Measures atmospheric pressure<br />Manometer: Measures the pressure difference<br />
    21. 21. Gas Pressure<br />When taking gas pressure the following things should be considered:<br />Pressure<br />Volume<br />Temperature <br />Boyle’s Law:<br /> For a fixed mass of gas at constant temperature, the pressure is inversely proportional to the volume.<br />x<br />=<br />x<br />V1<br />P1<br />V2<br />P2<br />
    22. 22. Energy<br />x<br />x<br />Force<br />W <br />d<br />F<br />=<br />Distance moved in the direction of the force<br />Work Done <br />=<br />
    23. 23. Different Forms of Energy<br />Kinetic energy<br />Potential energy<br />Gravitational energy<br />Elastic energy<br />Chemical energy<br />Electrical energy<br />Nuclear energy<br />Thermal energy<br />Radiated energy<br />
    24. 24. Energy<br />The law of conservation of energy<br /> Energy cannot be made or destroyed, but it can change from one form to another.<br />m<br />x<br />=<br />=<br />Kinetic Energy<br />Gravitational potential energy<br />v<br />g<br /> m<br />x<br />½ <br />2<br />h<br />V = Speed<br />Gain in kinetic energy is a loss in potential energy<br />
    25. 25. Scalar and Vector Quantities <br />Scalar: has magnitude but no direction<br />- Energy<br /><ul><li>Displacement
    26. 26. Velocity
    27. 27. Acceleration</li></ul>Vector: has magnitude and direction.<br /><ul><li>Speed (magnitude of velocity.
    28. 28. Time
    29. 29. Mass</li></li></ul><li>Efficiency and Power<br />Useful Work done<br />Efficiency<br />=<br />Total energy output<br />
    30. 30. x<br /> Work done<br />Power <br />=<br />Speed<br />Useful Power Output <br />Force<br />=<br />Time Taken<br />
    31. 31. Thermal Power Stations<br />Boiler<br />Steam<br />Fuel burner<br />Nuclear reactor<br />Thermal <br />Energy<br />Turbines<br />Generator<br />Electricity<br />Carbon<br />Dioxide<br />+<br />Thermal<br />Energy<br />+<br />+<br />Fuel<br />Oxygen<br />Water<br />
    32. 32. Thermal Power Stations Problems<br />Increased rate of global warming<br />Sulphur dioxide causes acid rain<br />Transporting fuels could lead to pollution due to leaks<br />Radioactive wastes are very dangerous<br />Nuclear accidents<br />
    33. 33. Power Schemes<br />1- Pumped storage scheme – wind farms<br />2- Tidal power scheme<br />3- Hydroelectric power scheme<br />
    34. 34. Energy Sources<br />Renewable<br />Hydroelectric and tidal energy<br /><ul><li>Expensive to build
    35. 35. Few areas are suitable
    36. 36. May cause environmental damage</li></ul>Wind energy<br /><ul><li>Large, remote, windy sites required
    37. 37. Noisy, ruin landscape</li></ul>Wave energy<br /><ul><li>Difficult to build</li></ul>Geothermal energy<br /><ul><li>Deep drilling difficult and expensive</li></ul>Solar energy<br /><ul><li>Sunshine varies
    38. 38. Solar cells difficult to transport</li></ul>Non-renewable<br />Coal, oil, natural gas<br /><ul><li>Supplies are limited
    39. 39. Carbon dioxide concentration is increasing</li></ul>Nuclear fuels<br /><ul><li>Expensive to build and decommission</li></li></ul><li>Thermal Effects<br />Solids-fixed volume and shape <br />Liquids-fixed volume but no fixed shape<br />Gases-no fixed shape and no fixed volume.<br />Internal energy: total kinetic and potential energy of all atoms in a material.<br /> Objects as the same temperature have the same average kinetic energy per particle<br />Hotter material  faster the particles move the more internal energy it has<br />
    40. 40. Absolute Zero<br />-273˚Ć= 0 Kelvin (0 K)<br />Kelvin Temperature/K = Celsius Temperature/˚Ć+273<br />This is the lowest temperature there is.<br /> It is a thermodynamic scale. It is based on the average kinetic energy of particles.<br />
    41. 41. Thermal Effects<br />Thermal expansion: this is when a substance is heated and its volume slightly increases.<br />The pressure law:<br /><ul><li>When the Kelvin pressure doubles so does the pressure
    42. 42. Pressure ÷ Kelvin temperature  always has the same value</li></ul>Thermal Conduction:<br />Conduction is the process by which thermal energy is transferred from the hot end to the cold end as the faster particles pass on their extra motion to particles along the bar.<br />
    43. 43. Thermal Effects<br />More thermal energy is transferred if :<br /><ul><li>Temperature difference across the ends is increased.
    44. 44. Cross-sectional area of the bar is increased
    45. 45. Length of the bar is reduced.</li></li></ul><li>Convection<br />Hot air rises and cold air sinks <br />
    46. 46. Thermal Radiation<br />This is when things that absorb this radiation are warmed up.<br />To increase the rate of evaporation<br /><ul><li>Increase the temperature
    47. 47. Increase the surface area
    48. 48. Reduce humidity
    49. 49. Blow air across the surface</li></li></ul><li>Specific Heat Capacity<br />x<br />x<br />=<br />Energy Transferred<br />Energy Transferred<br />=<br />t<br />Specific heat capacity<br />Temp change<br />c<br /> m<br />x<br />x<br />mass<br />Specific heat capacity is 4200J<br />ϫ<br />
    50. 50. Latent Heat of Fusion<br />x<br />mL<br />=<br />Mass<br />=<br />Specific Latent Heat<br />Energy Transferred <br />Energy Transferred <br />
    51. 51. Keep in mind<br />This was half of the Physics Syllabus 2011.<br />The information in this PowerPoint should only be used if you have actually understood most of the theory.<br />The rest of the syllabus should be up and running as soon as possible<br />BEST OF LUCK<br />

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