1. Limited time only! Sign up for a free 30min personal 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!

Gravitational force: action and reaction

  1. Sep 24, 2009 #1
    Consider two particles 1 and 2 that can interact with each other but are isolated from their surroundings. If an internal force from particle 1, for example, a gravitational force, acts on particle 2, then there must be a second internal force—equal in magnitude but opposite in direction—that particle 2 exerts on particle 1.
    But if the particle 2 exerts a gravitational force too? Will the net force exerted on particle 1 be the sum of the gravitational forces 1 to 2 and 2 to 1?
  2. jcsd
  3. Sep 24, 2009 #2


    User Avatar
    Homework Helper

    the force is given by

    [tex]F=G \frac{m_1 m_2}{r^2}[/tex]

    the force on 1 = - force on 2

    so F1= -F2
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Gravitational force: action and reaction
  1. Action and Reaction (Replies: 10)

  2. Action and reaction (Replies: 3)

  3. Action Reaction Forces (Replies: 2)