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Need help with physics

  1. Jan 28, 2007 #1
    a 1000-n crate is being held is being pushed across a level floor at a constant speed by a force of f of 300-n at an angle of 20.0 below the horizontal. what is the coefficient kinetic friction between the crate and the floor? if the 300 n force is instead pulling the block at an angle of 20.0 above the horizontal, what will be the acceleration of the crate? assume that the coefficient of riction is the same as in a.

  2. jcsd
  3. Jan 28, 2007 #2
    srry im really bad at physics ne1 wanna help me
  4. Jan 29, 2007 #3
    well, what is kinetic friction? Fk = q*Fn (q = coefficient)

    Fn is the force pushing upwards against the block by the floor. in this case it is due to gravity and the downward component of the man's push.

    draw a free-body diagram and go from there.
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