How a net force acts on 'Earth'?

[russ_watters]

You said''The fact that a force of 10N is applied to accelerate the object at first does not imply it applies a force of 10N on the second object''...So is this a fact that the the force applied on first object is not necessarily equal to the force it applies to the second object?...Because if it is not equal then of course there would be a net force on first object...

Yes, these are totally unrelated issues.

 

[CWatters]

You said''The fact that a force of 10N is applied to accelerate the object at first does not imply it applies a force of 10N on the second object''...So is this a fact that the the force applied on first object is not neccessarily equal to the force it applies to the second object?...Because if it is not equal then ofcourse there would be a net force on first object...

And you can extend post #26 to calculate the net force on M1.

 

[jim meyer]

The three laws of Newton are more clearly stated in Newton's Law: F=ma. This is most powerful statement in all of science.

 

[jbriggs444]

The three laws of Newton are more clearly stated in Newton's Law: F=ma. This is most powerful statement in all of science.

F=ma is the second law. The third law might be phrased as ##F_{ab} = -F_{ba}##