Magnitude of acting force are equal to reaction force and their direction are opposite their effects do not get cancelled
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Well, action and reaction forces are equal and opposite but they do not cancel since they are not applied on the same body .
For instance, if a block of mass m is sitting on a table. The action force 'mg' is applied by block on the table while the reaction force 'N' is applied by the table on the block in the form of Normal reaction(same magnitude 'mg'),hence they do not cancel.
Edit : I feel the need to explain the need of reaction force, for the above example, had the normal reaction not been there, there would be no force stopping the' m' mass block from going down, so its because of the normal reaction force that the block doesn't tear down the table and move downwards since the force acting on the block is cancelled.
example----
A ball falls on a nail, as soon as the ball strikes the nail, nail achieves a velocity, hence the force applied by the ball on nail is the net change in momentum per unit time , and the same force is applied by nail back on the ball....
For instance, if a block of mass m is sitting on a table. The action force 'mg' is applied by block on the table while the reaction force 'N' is applied by the table on the block in the form of Normal reaction(same magnitude 'mg'),hence they do not cancel.
Edit : I feel the need to explain the need of reaction force, for the above example, had the normal reaction not been there, there would be no force stopping the' m' mass block from going down, so its because of the normal reaction force that the block doesn't tear down the table and move downwards since the force acting on the block is cancelled.
example----
A ball falls on a nail, as soon as the ball strikes the nail, nail achieves a velocity, hence the force applied by the ball on nail is the net change in momentum per unit time , and the same force is applied by nail back on the ball....
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Hlo friend..
➡️It's very good if you have this doubt because it shows you are a thinking mind. But you'll be have to a better observant as well. Read it again.
1. You will find that action and reaction pairs always act on different bodies. Say if action force is acting on body A(left direction) and reaction force on body B(right direction) that's it. That means there is a net force on both bodies(assuming no other forces are there) so definitely they don't cancel and both bodies should accelerate in opposite directions.
2. In this case, you consider a isolated system with 2 charged particles inside it such that there is an equal and opposite force acting on both due to each other. Seems same, like previous case. Both forces are on different bodies. But question is, what is net force on the system? It's zero. Internal forces cancel each other.
✔️Case 1 may be sufficient to clear your doubt. No worries if you don't understand case 2. Just keep learning and thinking.
HOPE IT HELPS YOU..
REGARDS
@sunita
➡️It's very good if you have this doubt because it shows you are a thinking mind. But you'll be have to a better observant as well. Read it again.
1. You will find that action and reaction pairs always act on different bodies. Say if action force is acting on body A(left direction) and reaction force on body B(right direction) that's it. That means there is a net force on both bodies(assuming no other forces are there) so definitely they don't cancel and both bodies should accelerate in opposite directions.
2. In this case, you consider a isolated system with 2 charged particles inside it such that there is an equal and opposite force acting on both due to each other. Seems same, like previous case. Both forces are on different bodies. But question is, what is net force on the system? It's zero. Internal forces cancel each other.
✔️Case 1 may be sufficient to clear your doubt. No worries if you don't understand case 2. Just keep learning and thinking.
HOPE IT HELPS YOU..
REGARDS
@sunita
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