General Physics

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  • General Physics
    • Speed and Acceleration
      • SPEED = DISTANCE / TIME
      • ACCELERATION = CHANGE IN VOLOCITY / TIME
    • Speed, distance and time graphs
    • Density
      • DENSITY= MASS / VOLUME
    • Mass and weight
      • WEIGHT = MASS X GRAVITY
    • Forces
      • MOMENT OF A FORCE ON A PIVOT = FORCE X PERPENDICULAR DISTANCE FROM PIVOT
      • Hooks Law
        • When an elastic object - such as a spring - is stretched, the increased length is called its extension. The extension of an elastic object is directly proportional to the force applied to it:
      • FORCE = MASS X ACCELERATION
    • Energy
      • Transfer
        • Energy is converted from one type to another
      • General
        • Measured in Joules
        • Energy can only be transformed from one type to another  never made
        • Types of energy
          • Chemical
          • Electric
          • Elastic/ strain
          • Kinetic
            • KE=MASS X (VOLOITY)2
          • Gravitational Potential
            • GPE= MASS X GRAVITY X HEIGHT
              • GPE= WEIGHT X HEIGHT
          • Heat
          • Sound
          • Light
          • Nuclear
      • Sources
        • Hydroelectric
          • Renewable
          • Power stations near lakes, reservoirs'
          • No CO2 emitted
        • Nuclear
          • Non-renewable
          • Nuclear fission- no CO2 produced
            • More energy produced than fossil fuels
            • Nuclear waste-Toxic and harmfull
            • Neutron hits the nucleus and as the nucleus splitting releases mainly heat energy and as the neutron splits it can travel to hit more nucleus' to create more energy
        • Wind energy
          • Renewable
          • No CO2
        • Gas
          • Non-renewable
          • 370kg/mwh CO2
    • Efficiency
      • Efficiency% = usefull energy outputx100/ total energy output
    • Work and Power
      • WORK DONE = FORCE X DISTANCE
      • POWER = ENERGY/ TIME
    • Pressure
      • PRESSURE = FORCE/AREA
      • WATER PRESSURE= DENSITY X GRAVITY X HEIGHT

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