1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Work - Stairs

  1. Sep 25, 2011 #1
    How much work is done when a 75-kg person climbs a flight of stairs 10 m high at a constant speed

    A.) 7.35 * 10^5 j
    B.) 750 j
    c.) 75 j
    D.) 7500 j
    E.) 7350 J

    W = (f)(d)
    f = ma
    W= (ma)(d)

    Now I'm assuming that the force is parallel to the stairs (distance as the person walks up the stairs)

    so I found the force
    f = ma
    f= (75)(9.81) = 735.75

    then I solved for work
    W = (f)(d)
    W = 735.75(10)
    W = 7357.5 j

    answer E

    I'm new to to work so I just want to clarify if I'm doing the problem right or wrong
    If I made any errors please feel free to correct me
    We learn by our mistakes after all

    Thank You
  2. jcsd
  3. Sep 25, 2011 #2
    Your answer is correct. Work is just force acting over a distance. Here, the force is the weight of the person (force of gravity), and the distance is the height of the steps.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook