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!

Homework Help: Work done by a person climbing stairs

  1. Nov 30, 2013 #1
    1. The problem statement, all variables and given/known data
    Calculate the work done by a 52.98 kg person, who climbs a set of 0.20 m tall stairs (starting from rest) in 2.96s.
    Calculate the power required to achieve this.

    2. Relevant equations

    3. The attempt at a solution
    My issue with this question has been identifying the force which is acting in the situation. I know that Fg applies (mass • 9.81 m/s) and that there must be an applied force of some sort because the person is moving (working against gravity, I suppose?), but I am not sure which information I should use to calculate the "F" variable in the w=F•d equation. I think they want the power in watts (Joules per second).
    Last edited: Nov 30, 2013
  2. jcsd
  3. Nov 30, 2013 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi Sen.Lemonsnout! Welcome to PF! :smile:

    Assume that he climbs at a constant speed …

    then the net force is zero, so the force he uses is … ? :wink:
  4. Nov 30, 2013 #3
    Thanks- I was definitely overthinking things!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted