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    • gravity
      • All objects have a force that attracts them towards each other. This is called gravity
      • Gravitational force increases when
        • the objects are closer
        • the masses are bigger
      • Gravity is a force that un-noticably pulls you down (to the centre of the earth)
      • The Moon's gravity is one sixth of the Earth's gravity
    • wieght
      • Weight is a force caused by gravity
      • The more mass the object has the greater its weight will be
      • Weight is measured in newtons
      • On the surface of the Earth an object with a mass of 1 kg has a weight of about 10 N
    • mass
      • The mass of an object is the amount of matter
      • The more matter an object contains, the greater its mass
      • Mass is measured in kilograms, kg, or grams, g
    • push
    • pull
    • NOTE
      • Remember that mass is measured in kilograms, kg, and weight is measured in newtons, N
      • The weight of an object changes if the strength of gravity changes
    • Pressure
      • Equation - pressure = force ÷ area = ...nm2/pa
    • Frictional Forces
      • friction between tyres and the road stop cars from skidding
      • friction between the brakes and wheel help bikes and cars slow down
      • friction between our shoes and the floor stop us from slipping
      • air resistance
        • air resistance is caused by air against the fast moving object
        • The faster the vehicle moves, the bigger the air resistance becomes
      • Streamlined
        • Streamling in where an object is specifically shaped to let the air flow past/over the object


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