Question

Which of the following option is incorrect regarding action-reaction forces of Newton's third law of motion?
1. both forces should be equal in magnitude
2. both forces should be parallel and opposite in direction.
3. both forces should be at same object.
4. All of the above are correct for action reaction pair

Answer 1

Correct Answer - Option 3 : both forces should be at same object.

CONCEPT:

• According to Newton's Law of force, For action-reaction pair three conditions should be satisfied:

1. both forces should be equal in magnitude
2. both forces should be parallel and opposite in direction.
3. both forces should be on different bodies.

EXPLANATION:

• For action-reaction pair three conditions should be satisfied:

1. both forces should be equal in magnitude. (Option 1)
2. both forces should be parallel and opposite in direction. (Option 2)
3. both forces should be on different bodies. (Option 3)

• Point 3 says both the forces should act on different bodies. 
• It means both the forces will act at different points, not on the same object.
• So option 3 gives an incorrect statement.