Momentum

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  • Momentum
    • p=mv
      • p is momentum (kgms-1)
      • m is mass (kg)
      • v is velocity (ms-1)
    • Newtons laws
      • 1st: an object remains at rest or at a constant velocity unless acted on by an external force
        • in a vacuum, no friction or gravity
      • 2nd: the rate of change of momentum of an object is proportional to the resultant force acting upon it
        • F=ma
          • F is force (kgms-2)
          • m is mass (kg)
          • a is acceleration (ms-2)
        • ?p= m?v
        • F=  ?p/t
        • Impulse = F ?t = ?p
      • 3rd: for every actions, there is an equal and opposite reaction
        • Conservation
          • total momentum of a system must remain constant
            • provided no external forced act upon it
          • m(a)v(a) + m(b)v(b) = 0
            • therefore,  m(b)v(b) = - m(a)v(a)
    • Impact forces
      • F=mv/t
        • momentum / contact time
          • rebound impacts ?p = (-mv) -(mu)
      • F= mv-mu / t
    • Conservation
      • total momentum of a system must remain constant
        • provided no external forced act upon it
      • m(a)v(a) + m(b)v(b) = 0
        • therefore,  m(b)v(b) = - m(a)v(a)
    • Elastic and Inelastic Collisions
      • Perfectly Elastic
        • all momentum conserved
        • all Ek conserved
        • relative speed of approach = relative speed of separation
      • Perfectly Inelastic
        • momentum conserved
        • Ek not conserved
        • Things stick together
      • General Inelastic
        • momentum conserved
        • Ek not conserved
        • no ability to comment on afterwards speed unless calculation done
    • Explosions
      • recoil with equal and opposite momentum
      • use of conservation of momentum

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