1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    f=ma
    w=mg

    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

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    At Earth's surface, what force has to be applied to the object just to keep it where it is?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted