PHY 121 Ch 8 Lecture

# PHY 121 Ch 8 Lecture - Lecture 14 Tuesday March 4 1...

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1 Lecture 14 Tuesday, March 4

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2 Momentum: A. is equal to mass times speed. B. is equal to mass times acceleration. C. is a vector quantity. D. is a scalar quantity.
3 The x -component of impulse... A. is always equal to the x-component of momentum. B. is the area under the F x (t) curve. C. is the slope under the F x (t) curve. D. none of the above.

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4 Momentum is conserved... A. in an isolated system. B. in all systems that contain two particles. C. in all systems under constant external forces. D. only if all particles in the system move with constant velocity.
5 A completely inelastic collision A. is the only type of collision in which momentum is conserved. B. occurs when the colliding objects stick together after the collision. C. occurs when velocity is conserved. D. occurs when the sum of the masses of the colliding objects is the same before and after the collision.

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6 Momentum The momentum of a particle is defined as: ! p = m ! v Notice that momentum is a vector quantity! Since momentum is and force is , what is the relationship between momentum and force? ! p = m ! v ! F = m ! a
7 Momentum and force d ! p dt = d m ! v ( ) dt = m d ! v dt = m ! a Force is equal to the rate of change of momentum. If we know the momentum at all times, its slope gives the force. What if we know the force at all times?

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8 Impulse Acceleration, Force Velocity, Momentum slope of area under !
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