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!

Pushing Cart Down a Ramp

  1. Sep 12, 2008 #1
    1. The problem statement, all variables and given/known data
    A professor has to haul a cart down a ramp. The ramp has an angle of about 10 degrees and is about 5 meters long. His initial speed at the top of the ramp is 6 m/s, and the cart has a mass of about 95 kg. How hard does he have to pull on the cart so that at the bottom of the ramp, its speed does not exceed 7 m/s? Neglecting friction, what is the magnitude of the minimum force he has to exert on the cart?

    Initial Velocity: 6m/s
    Final Velocity: 7m/s
    Mass: 95kg
    Distance: 5m
    Angle: 10

    2. Relevant equations

    Vf^2=Vi^2 +2ax
    F=ma

    3. The attempt at a solution

    Well first I found the acceleration of the cart.

    49=36 +2a(5)
    a=1.3

    Then I thought that the net force would be
    F=mgsin10 + ma

    so

    F= 95*9.8*sin(10) + 95*1.3 = 285 N

    But Im still getting it wrong. Did I make a mistake someplace?
     
  2. jcsd
  3. Sep 12, 2008 #2
    Ohh nevermind I got it. I was right, dumb mistake.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Pushing Cart Down a Ramp
  1. Cart and Ramp (Replies: 5)

  2. Cart pushed up a ramp (Replies: 3)

  3. Pushing a Cart (Replies: 2)

Loading...