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Ch. 8 - Momentum

 What’s the difference between a moving semi truck and a moving skateboard? . Mass… but also…. Ch. 8 - Momentum. I. Momentum:. Inertia (mass) in motion (velocity)…. A. Momentum = mass x velocity. B. p = m D v (SI units = kgm/s). C. Ships going full speed have huge momentum…Titanic.

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Ch. 8 - Momentum

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  1.  What’s the difference between a moving semi truck and a moving skateboard?  Mass… but also… Ch. 8 - Momentum I. Momentum: Inertia (mass) in motion (velocity)… A. Momentum = mass x velocity B. p = mDv (SI units = kgm/s) C. Ships going full speed have huge momentum…Titanic II. Impulse: exerting a force over a time interval A. Impulse (no abb.) = Ft (SI units = Ns) B. ** D momentum = impulse  mDv = Ft ** C. Ships coming into port, falling on carpet, catching an egg or ball!

  2. III. Conservation of Momentum: Momentum of a system must be conserved A. Collisions – 2 types 1. Elastic (bouncy): Pool balls, Newton’s Cradle, etc.  m1v1 + m2v2 = m1v3 + m2v4 2. Inelastic (sticky): Railroad cars, tackling, etc.  m1v1 + m2v2 = (m1 + m2)v3 B. Momentum Vectors: Vector sums before a collision = sum of momentum vectors after a collision!

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