1. Limited time only! Sign up for a free 30min personal 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!

Falling under Gravity

  1. Dec 8, 2015 #1
    1. What have I done wrong when I set this GCSE question?! (shortened)
    Gravity: 10 N/kg
    Bowling ball: weight 10 N, air resistance 0.05 N, overall force 9.95 N
    Football: mass 0.5 kg, air resistance 0.05 N

    Students need to work out:
    • effective force on the football (4.95 N)
    • bowling ball (a = F/m = 9.95 / 1 = 9.95 N/kg)
    • football (a = F/m = 4.95 / 0.5 = 9.9 N/kg)
    So... what have I messed up as I'm pretty sure their acceleration should be equal!?

    2. Relevant equations
    F = ma, W = mg

    3. The attempt at a solution
    I have played around with it and I'm missing something, help!
  2. jcsd
  3. Dec 8, 2015 #2


    User Avatar

    Staff: Mentor

    Why should the acceleration be the same when you take into account air resistance?
  4. Dec 8, 2015 #3
    Dumb... thanks for pointing out the obvious!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted