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Calculating the upward force

  1. Nov 2, 2016 #1
    1. The problem statement, all variables and given/known data

    Gr.11 Physics, about 2 months in so I don't know much.

    Bob pitches his calculator in to the air and watches it rise to a height of 5 meters above the floor, and rebound to a height of 4 meters. The calculator was in contact with the floor for ten milliseconds, and it has a mass of 500 grams. Calculate the upward force exerted on the calculator by the floor.

    2. Relevant equations

    Here's all the equations I think would be relevant?:

    Fn = Fg
    Fg = mg
    Ff = uFn
    Fnet = ma

    3. The attempt at a solution

    I'm not entirely sure where to start with such little info. I tried to get the Force of Gravity (Fg) like this:

    Fg = mg
    = (0.5kg)(9.8)
    = 4.9N

    But I feel like the fact that it was accelerating towards the ground would increase that?

    Any help is appreciated.
  2. jcsd
  3. Nov 2, 2016 #2


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    Science Advisor
    Homework Helper
    Gold Member

    No, none of those are interesting here.
    Does SUVAT mean anything to you?
    What about a relationship between force and momentum?
  4. Nov 2, 2016 #3
    No, and no :/ My teacher has a habit of giving us questions for things he hasn't taught us yet. Could you explain?
  5. Nov 2, 2016 #4
    Ah I found a video on exactly what I was looking for. I got it now :)
  6. Nov 2, 2016 #5
    Try to calculate the velocity right before and after the calculator hits the floor and see if you can use this to figure out the force
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