weight and mass

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  • mass and weight
    • what is mass
      • mass is defined as the amount of matter in a body
        • it is measued in kilograms(kg)
          • its a scaler quantity
    • what is weight
      • weight is a force and is a meaure of the size of gravitionalal pull on a ob ject exerted
        • near the surface of the earth,there is a force of 10N on each 1 kg of mass
          • we say that the earths gravitational field strengh, g, is 10 N/kg
      • the equation for weight
        • weight(N) = mass (kg) x acceleration due to gravity (m/s sqaured)
      • measured in newtons.vector quantity so it has size and direction
      • why is weight a force
        • due t the pull of gravity on the object
    • the value of g is rougly the same everywhere on earths surface
      • but the further you move away from earth,the smaller g becomes
        • in sace far away from plants,he gravitational force is 0 and its said to be weightless
    • on earth,the pull of gravity is 10N on a mass of 1 kg
      • the value of g is rougly the same everywhere on earths surface
        • but the further you move away from earth,the smaller g becomes
          • in sace far away from plants,he gravitational force is 0 and its said to be weightless
      • gravitation feild strengh (g)= 10N/kg
    • divid the g by 1000 o get the mg
    • the size of g also gives the gravitational acceleration,because from newtons second law
      • acceleration = f divided by m
        • g= w divided by m
          • the alternative set of units for g is m/s sqaured

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