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Momentum

Momentum. Linear momentum (p) product of an object’s mass and velocity Unit of kg*m/s It is a vector Direction is that of velocity. Impulse. Impulse ( p)—change in momentum Be sure to note direction of initial and final momentum Newton’s 2 nd Law originally defined in terms of impulse

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Momentum

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  1. Momentum • Linear momentum (p) • product of an object’s mass and velocity • Unit of kg*m/s • It is a vector • Direction is that of velocity

  2. Impulse • Impulse (p)—change in momentum • Be sure to note direction of initial and final momentum • Newton’s 2nd Law originally defined in terms of impulse • For a given impulse, longer time of contact yields a smaller force (airbags)

  3. Conservation of momentum • In the absence of an outside force, total momentum of a system is constant

  4. Collisions • Inelastic—momentum is conserved, but some KE is lost in the collision • Perfectly inelastic—objects link together and move as one after the collision • Elastic—both momentum and KE are conserved

  5. Center of mass • Center of mass—point at which, for most purposes, a system’s mass behaves as though it were concentrated there • Ex. Shotgun pellets follow different paths, but center of mass follows the expected parabolic path

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