if we apply a force on any body than in the same way that body also applies force on us but we didn't move . WHY?
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when you are moving an object, the object starts opposing to move in the direction you are applying the force, so that another force with the same modulo and opposite direction appears opposing to move in the way you are moving the object.
What you really mean by “moving” it, it is that the object is experiencing Work, and because of the Work experienced it moves.
Work depends on the angle between F and distance, (F and d), and also depends on the values of d and F: W = F*d*cos(F,d angle) So in fact mathematically the object would be experiencing another work of angle 180 º (the object is opposing to move so you need to keep making an effort to move it because if you stop it will stop moving at any time too because of frictional force, by the way if you kept moving it will keep being hard to keep moving it because of the force it is creating opposite your movement) and the result will be negative, because of the cos(180) so then as the work is negative that means that the object is moving in the other direction avoiding your move (again because of third Newton law).
To sum up everything:
You move the object, because of that another force appears, then because you are moving it, you have moved from one point to the other then you have walked a distance. Because of that both forces one in your direction and the other in the opposite direction will experience work because of the movement experienced. So that in fact YES you are being moved back, that is what you experience as it is hard for example to move a big object, you make a big effort but then all the forces get canceled and because of that the object is still hard to move.
Now something tricky that made me think a lot was the following:
When an object is attracted to another by gravity again two forces appear, so imagine you have an object over the table, it is there because of the force of gravity, there is an attraction between two objects (earth and object in the table), so that means that there is a force that goes from the object to the earth center, and another with same modulo and opposite direction (3rd Newton law, it is the one you asked for), again what I didn’t understood (it wasn’t explained this way, it was a physics explanation for a problem where we needed to calculate how a ball would move down a surface) was that the opposite force appeared and the explanation the teacher gave us was that if the force from the mobile phone to the sky :D wasn’t there, that would mean that the object would start going down the table as going through all the objects no matter what. And when I got that it was like… It makes sense. Because the table is opposing the object to fall, that means that the table is holding it in order to avoid the fall of it.
I hope it helped and that the explanation is easy to follow.
What you really mean by “moving” it, it is that the object is experiencing Work, and because of the Work experienced it moves.
Work depends on the angle between F and distance, (F and d), and also depends on the values of d and F: W = F*d*cos(F,d angle) So in fact mathematically the object would be experiencing another work of angle 180 º (the object is opposing to move so you need to keep making an effort to move it because if you stop it will stop moving at any time too because of frictional force, by the way if you kept moving it will keep being hard to keep moving it because of the force it is creating opposite your movement) and the result will be negative, because of the cos(180) so then as the work is negative that means that the object is moving in the other direction avoiding your move (again because of third Newton law).
To sum up everything:
You move the object, because of that another force appears, then because you are moving it, you have moved from one point to the other then you have walked a distance. Because of that both forces one in your direction and the other in the opposite direction will experience work because of the movement experienced. So that in fact YES you are being moved back, that is what you experience as it is hard for example to move a big object, you make a big effort but then all the forces get canceled and because of that the object is still hard to move.
Now something tricky that made me think a lot was the following:
When an object is attracted to another by gravity again two forces appear, so imagine you have an object over the table, it is there because of the force of gravity, there is an attraction between two objects (earth and object in the table), so that means that there is a force that goes from the object to the earth center, and another with same modulo and opposite direction (3rd Newton law, it is the one you asked for), again what I didn’t understood (it wasn’t explained this way, it was a physics explanation for a problem where we needed to calculate how a ball would move down a surface) was that the opposite force appeared and the explanation the teacher gave us was that if the force from the mobile phone to the sky :D wasn’t there, that would mean that the object would start going down the table as going through all the objects no matter what. And when I got that it was like… It makes sense. Because the table is opposing the object to fall, that means that the table is holding it in order to avoid the fall of it.
I hope it helped and that the explanation is easy to follow.
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