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Problems with Newton's third Law

  • Thread starter Groat
  • Start date
  • #1
7
0

Homework Statement



This is more of a concept problem than one of number manipulation. I was wondering, if when a horse pulls forward on a cart with a force of 500 N and the cart pulls back with a force of 500 N by Newton's 3rd Law, how does the cart move if the net force is 0?

Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
648
2
Welcome to Physics Forums.
The net force on the cart isn't 0 N, it's 500N.
The Newton 3 reaction force is acting on the horse.
 
  • #3
286
0
how it is zero?..
you said that the horse pulls the cart with a force of 500N , in this case you have a force of 500N acting on the cart ..
Now, you said that by Newtons third law there should be another 500N force, but pay attention this other force is acting on the horse!! not the cart, so thats why the cart is moving! .. can you see the difference now? .. if not ask again .. :)
 
  • #4
7
0
Thanks a bunch, yeah it makes sense now
 

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