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Calc force needed given objects mass & required acceleration

  1. Apr 27, 2016 #1
    1. The problem statement, all variables and given/known data
    What is the force needed to accelerate a 2.0kg ball at 3.0ms^-2

    a) In a frictionless horizontal surface, near the surface of the Earth
    b) Vertically upward, near surface of the Earth

    2. Relevant equations

    3. The attempt at a solution
    For a) F=2(3) = 6N
    By inputing the variables into the formula, I got to an answer. but, I do not know how a) differs from b), as in what route to do for b...

    Thank you for any help. :-)
  2. jcsd
  3. Apr 27, 2016 #2


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    At Earth's surface, what force has to be applied to the object just to keep it where it is?
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