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Help! Newtons Second law

  1. Sep 21, 2008 #1
    ok, i need some serious help with newtons second law. like i kind of understand it, but adding things like friction are giving me real problems. does anyone have any good resources or tips on how to understand/comprehend this?

    and i have a prolem:

    a man pushes a 15 kg lawnmower at constant speed with a force of 90 N directed along the handle, which is at an angle of 30 degrees to the horizontal. calucalte: (a) the horizontal frictional force on the mower, and (b) the normal force
    on the mower.

    well i know the acceleration is zero, but dont you need the kinetic friction to find the frictional force?
    Last edited: Sep 21, 2008
  2. jcsd
  3. Sep 21, 2008 #2
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