Forces assessment revision

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  • Forces
    • Scalars and vectors:
      • Scalar quantities have size or magnitude but direction is not specified. For example: -distance -speed and mass.
        • Vector quantities have magnitude and a specific direction. For example: displacement, velocity, force.
    • contact and non contact forces
      • Contact forces are forces that act between two objects that are physically touching each other. such as friction,      resistance and tension.
        • Non contact forces are forces that act between two objects that are not physically touching each other. such as magnetism and gravity
      • Static flyer practical equiptment list:  Cotton towel, plastic bag, scissors, balloon.
      • Static flyer steps: 1-cut off a section from the open end of the bag. 2-blow up a balloon and tie the end. 3- Rub the towel on the balloon 4-Rub the towel on the plastic. 5-Suspend the plastic cover over the balloon and let go
      • Newtons third law: 'when two objects interact with each other they exert equal and opposite forces in each other.
    • Work Done
      • when a force makes an object move by a distance you can say that work is done on the object. The work is EQUAL to the energy transferred to the object.
      • Work done equation:
        • Work done= force x distance
    • parallelogram and resolution forces
      • resultant forces= a single force that has the effect of all forces acting on an object.
    • center of mass and gravity
      • Weight (N) The weight of an object and the mass of an object are directly            proportional.
      • weight of an object = weight(n)=     mass(kg) x gravitational field strength (n/kg)
    • extension of a spring
      • there is  linear relationship between force and extension. The extension of a sprint is directly proportional to the force.
      • By overstretching the spring we have exceeded the limit of proportionality
      • Hookes law: force=spring constant x extention        Foxes Kill Elephants
      • work done: 0.5 x spring constant(n/m) x extension squared (m)
      • extention = new length - origional length


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