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Homework Help: Forces 2 Questions PLEASE HELP

  1. Nov 11, 2007 #1
    1. The problem statement, all variables and given/known data

    1. A car tows a van of mass 1000kg with uniform speed of 10m/s. The tension in the coupling is 500N. Explain why the thension is not zero. The car now accelerates at 2m/s^2. What is the new tension in the coupling?

    2. A crane is to haul a mass of 1000kg onto a deck of a ship. Find the tension in the cable when the load is A Held at rest off the ground. B Raised with an acceleration of 0.5m/s^2 C Raised with uniform speed of 1.5 m/s D Lowered with an acceleration of 1m/s^2. E Brought to rest while being lowered at 0.4 m/s^2

    3. The attempt at a solution
  2. jcsd
  3. Nov 11, 2007 #2


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    Science Advisor

    That's unfotunate! Do you have no idea why there should be tension in a coupling even if there is no acceleration? What would happen to the trailer if the trailer hitch gave way? Why?

    For the rest, surely you know that "force equal mass times acceleration"!
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