Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Tractive force exerted by a lorry

  1. Aug 20, 2010 #1
    Hey would really appreciate help with this question, thx :)

    A lorry, of mass 12500kg, starts from rest up a hill. The hill has a gradient of 1:6 and the lorry accelerates at a constant rate of 0.1m/s2. If the resistance to motion, not the gravitational resistance, of the lorry is 2000N, what is the tractive force of the lorry?

    thanx again
  2. jcsd
  3. Aug 24, 2010 #2
    This thread should go to the homework section.

    Start with a freebody diagram, can you tell all the forces involved ?

    How can you relate the given mass and the given resultant acceleration ?

    How can you relate self weight, slope effect on weight vector components, motion resistance and the resultant net acceleration ?
  4. Aug 24, 2010 #3


    User Avatar
    Science Advisor
    Gold Member

    The total tractive force will be the component of the lorry's weight pointing parallel to the incline and the acceleration force. Do you remember how to decompose a vector force into trigonometric components?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook