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!

Net force

  1. Sep 20, 2006 #1
    ugh I've got problems with newton again. >.<

    On vacation, your 1500 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 2.00 m/s^2.
    What force does the trailer exert on the car?

    F=ma so: Force of car is 1.08 kN and Force of trailer is 3.0 kN. I thought it would be 1.08-3.0 but I was wrong. What do I need to do?
  2. jcsd
  3. Sep 20, 2006 #2
    You need to invoke newton's 3rd law: the law of equal and opposite action-reaction pairs.
  4. Sep 20, 2006 #3
    Got it. Thanks. 1.08 kN. I acually got it the first time, only typed it in wrong. omg this class is going to kill me. I'm sure to have another question with in the next 3 minutes....
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Net force
  1. Net Force (Replies: 2)

  2. Net forces (Replies: 1)

  3. Net Force? (Replies: 17)

  4. Net Force and Net Work (Replies: 1)

  5. Net Force (Replies: 3)