Question

1. why dont action-reaction forces cancel each other out?

action-reaction forces act on different objects.
action-reaction forces do cancel each other out.
action-reaction forces act in opposite directions.
action-reaction forces are not equal.

Explanation:

According to Newton's third law, action - reaction forces are equal in magnitude and opposite in direction. But they act on different objects. For example, when a book is placed on a table, the book exerts a force (action) on the table, and the table exerts an equal and opposite force (reaction) on the book. Since these forces act on different objects (book and table), they do not cancel each other out. If they acted on the same object, they would cancel (but that's not the case for action - reaction forces). Option B is wrong as they don't cancel. Option C is a property of action - reaction forces but not the reason they don't cancel. Option D is wrong as action - reaction forces are equal.

Answer:

A. Action - reaction forces act on different objects.