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Phyiscs help needed

  1. Feb 24, 2012 #1
    if water in a container in a car and the car accelerates why the surface of the water is perpendicular to the net force of gravity and fictitious force not to the net of normal and gravitational force?
  2. jcsd
  3. Feb 24, 2012 #2


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    It's the same net force on the water, the only difference is the frame of reference, such as inside the car (fictitious force, no apparent normal acceleration), versus the ground outside the car (force related to normal acceleration of water).
  4. Feb 24, 2012 #3
    you dont get what i mean
    imagine the surface of the water
    it will be perpendicular to net force of gravity and fictitious force
    while the normal force is the actual acting force
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