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Homework Help: Helicopter - Lift Force

  1. Oct 29, 2006 #1
    A 4600 kg helicopter accelerates upward at 2.0 m/s^2. What lift force is exerted by the air on the propellors?

    I don't know how to do it.

    Please help :confused:
  2. jcsd
  3. Oct 29, 2006 #2
    Draw a Free Body Diagram (with every force) and remember that [itex]F=ma[/itex] and [itex]w=mg[/itex].
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