Physics A2 Level

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Physics A2 Level
2011-12-15 05:18:22
physics alevel force momentum

Force and Momentum
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  1. Force
    • needed to change the velocity of an object
    • rate of change of momentum
  2. Momentum
    • mass x an objects velocity
    • units: kgms-1
    • vector quantity
    • p=mv
  3. Newton's Laws of Motion
    • First: an object remains at rest or in uniform motion unless acted on by a force
    • Second: the rate of change of momentum of an object is proportional to the resultant force on it
    • Third: when objects interact they exert equal and opposite forces on each other
  4. Impulse
  5. Force-time graphs
    • the area under the line of a force-time graph represents the change of momentum or the impulse of the force
  6. Principle of Conservation of Momentum
    • For a system of interacting objects, the total momentum remains constant, provided no external forces acts on the system
    • mBvB + mAvA = mAuA + mBuB
    • (mB + mA)V = mAuA + mBuB
  7. Elastic and Inelastic Collisions
    • Elastic: one where there is no loss of kinetic energy, e.g. bouncy ball
    • Totally Inelastic: one where the colliding objects stick together, e.g. car crash
    • Partially Inelastic: one where the colliding objects move apart and have less kinetic energy after the collision than before
  8. Explosions
    • mBvB = -mAvA
    • move apart in opposite directions