Register to reply

Gravitational force: action and reaction

by mark_ch
Tags: action, force, gravitational, reaction
Share this thread:
Sep24-09, 07:54 PM
P: 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?
Phys.Org News Partner Physics news on
Step lightly: All-optical transistor triggered by single photon promises advances in quantum applications
The unifying framework of symmetry reveals properties of a broad range of physical systems
What time is it in the universe?
Sep24-09, 08:25 PM
HW Helper
P: 6,202
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

Register to reply

Related Discussions
Ampère force law, action, reaction Classical Physics 5
Action without reaction Classical Physics 5
Action/reaction : if we do an action that requires energy of the whole universe General Physics 2
Action/reaction force in relation to Newton's 3 law Introductory Physics Homework 2