Momentum - PowerPoint PPT Presentation

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Momentum

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Momentum = m x v, it's a vector, P = m x v. Remember F = P/ time = m v/t = ma ... Impulse is defined as Ft = Force x time. Ft = mv, this is the impulse ... – PowerPoint PPT presentation

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Title: Momentum


1
Momentum Impulse
  • Think of P as in
  • Pmomentum

2
Momentum Impulse
  • Momentum m x v, its a vector, P m x v
  • Remember F ? P/ ? time m ?v/?t ma
  • Impulse is defined as F?t Force x time.
  • F?t m?v, this is the impulse momentum theorem,
    an impulse causes a change in momentum (big deal)

3
Momentum and Impulse
  • F?t m?v
  • This is often used when youre trying to find the
    average force during a short interval of time,
    you can use the change in momentum. For example,
    like hitting a golf ball, the force happens over
    a short time and its very non-linear, but you
    can determine the average force if you know the
    change in momentum.

4
Conservation of momentum
  • For Momentum Conservation, This rule works for
    2 objects colliding or interacting.
  • ?(mv)before ?(mv)after
  • Typically 3 cases
  • A moving object runs into a stationary object.
  • Objects explode away from each other, both
    starting at rest
  • Both objects moving , then colliding

5
Elastic and Inelastic Collisions
  • In a pure Elastic collisions, 2 objects bounce
    off each other and Kinetic Energy is conserved,
    meaning the total KE before total KE after (KE
    ½ mv2).
  • Inelastic collisions, objects stick together, KE
    is not conserved.
  • In either case, can still use conservation of
    Momentum to determine velocities.
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