According to Newton's third law, whenever objects A and B interact with each other, they exert equal and opposite forces upon each other. I have always struggled with how to apply this law to problems and real life.
Suppose I get a pull from my friend with some force, then I get pulled forward by a large distance as compared to the distance covered by my friend. Isn't this a case where Newton's third law of motion fails? Or, does this happen because of the difference in our masses?
My second question is about the tension in the rope in Atwood's Machine (two unequal masses connected by a rope on either side of a friction-less pulley). http://hyperphysics.phy-astr.gsu.edu/hbase/atwd.html I have solved various pulley mass problems but I have not thought about applying Newton's Third Law of Motion to it.
Is tension the counterforce to weight? Consider a segment of rope from which a mass is suspended in Atwood's Machine. That segment will experience a force $m1g$ from the weight. People say this weight is the reason for the counterforce in that segment, and that this force will travel all the way through the rope to the other segment resulting in a uniform tension. If this is correct then I can see the uniform tension around the rope as an application of newton's third law but the fact that this resulted from the weight negates the third law and also this will mean that m1=m2 where m1 and m2 are the masses at each segment ...can somebody explain this to me