According to Newton's third law an object exerts equal and opposite force.
So when I push a box the box gives a equal force to me if both are giving equal forces then why do the box moves from its position?? best answer will be brainlist.
Answers
Explanation:
Because when we move an object forward, we're also being moved backward. That's the Newton's third law, and it's absolutely correct.
But you often see that when we move an object, we seem to not move at all. That's a deceiving look. The third law says F = F', but F depends on mass from the relation F = ma. So even though both objects get the same force, it depends on how big the mass of each object, the bigger the object, the smaller the acceleration it gets, thus the smaller the distance it travels compared to the other object. We do move backward, but the move is so small that we hardly notice...
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This is common misconception with my students too, and the only way to understand it you must draw all forces that act on both objects (in total five forces)!
In order to make things clearer, I will label the force with which table acts on book as F12 and not FN! Also suppose that z axis is vertically up, so positive forces push upward and negative forces push downward.
There are two forces acting on book, its gravitational force ,book (downward) and the force of table on the book (upward). According to first Newton law for the book they are equal by magnitude
- ,book=0.
According to the third Newton law book must be acting on table with the force (downward). So there are three forces acting on table: its gravitational force,table, force of the book (both downward) and the force of the ground FN (upward)!
Now let's write the first Newton's law for the table
,--table=0.
Consequently
,=+table=0. table=Fg,book+Fg,table
The ground force must support both book and table! Isn't that obvious?
Conclusion: So third Newton's law is perfectly valid for this case as well!
If you still do not understand, write on the paper book, table, and all five forces (two acting on the book and three acting on the table).