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					Momentum
    A.   Momentum
    B.   Impulse
    C.   Collisions
A. Momentum

   Momentum
     The quantity of motion that an
      object has
     Mass in motion

   Momentum depends on mass
    and velocity
   Momentum = mass x velocity
       p = mv
           kg (m/s)
A. Momentum

   Momentum is in the same
    direction as the velocity of the
    object
A. Momentum

   Determine the momentum of a:
   60-kg halfback moving eastward
    at 9 m/s.
   1000-kg car moving northward
    at 20 m/s.
   40-kg freshman moving
    southward at 2 m/s.
A. Momentum

   Determine the momentum of a:
   60-kg halfback moving eastward at 9
    m/s.
       540 kg m/s east
   1000-kg car moving northward at 20
    m/s.
       20000 kg m/s north
   40-kg freshman moving southward at
    2 m/s.
       80 kg m/s south
A. Momentum

   A car possesses 20 000 units of
    momentum. What would be the car's
    new momentum if ...
   its velocity were doubled.
   its velocity were tripled.
   its mass were doubled (by adding
    more passengers and a greater load)
   both its velocity were doubled and its
    mass were doubled.
A. Momentum
   A car possesses 20 000 units of
    momentum. What would be the car's new
    momentum if ...
   its velocity were doubled.
       40000 kg m/s
   its velocity were tripled.
       60000 kg m/s
   its mass were doubled (by adding more
    passengers and a greater load)
       40000 kg m/s
   both its velocity were doubled and its mass
    were doubled.
       80000 kg m/s
A. Momentum
A. Momentum

   Force changes the velocity of an
    object:
   If the force acts opposite the
    object’s motion, it slows the
    object down
   If force acts in the same
    direction as the object’s motion,
    then force speeds the object up
A. Momentum
B. Impulse

   Force x time = impulse
   Impulse = change in momentum
   Impulse-momentum change
    equation
C. Collisions

   Collisions
   An object experiences a force
    for a specific amount of time
    which results in a change in
    momentum
       The object’s mass either speeds
        up or slows down
C. Collisions




   Greatest velocity change?
       B
   Greatest acceleration?
       B
   Greatest momentum change?
       B
   Greatest impulse?
       B

				
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posted:12/11/2011
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