Consider Stop To Think 13.2, reproduced below. Which is the correct answer ? Please read the question carefully, you are asked to compare the magnitude of the force exerted on body 2 by body 1 to the magnitude of the force exerted on body 1 by body 2.

Question

Consider Stop To Think 13.2, reproduced below. Which is the correct answer ?  Please read the question carefully, you are asked to compare the magnitude of the force exerted on body 2 by body 1 to the magnitude of the force exerted on body 1 by body 2.

BlackTom AI · Accepted Answer

The core idea here is Newton's third law: when two bodies interact, the force exerted by one on the other has the same magnitude as the force exerted by the second on the first, but in the opposite direction.

Option c: 'The same size' — This is the correct statement. It directly matches Newton's third law, which says the interaction forces are equal in magnitude.

Option a: If this option says that the force on body 2 by body 1 is greater than the force on body 1 by body 2, it is incorrect because the magnitudes must be equal for a given pair of interacting bodies, regardless of their masses or speeds at the moment of interaction (as long as we’re considering the action-reaction pair).

Option e: If this option suggests that the force on body 1 by body 2 is greater, it similarly conflicts with the equal-magnitude aspect of the action-reaction pair and is therefore incorrect.

Option b: If this option claims the forces act in the same direction, it’s wrong. The forces are equal in magnitude and opposite in direction; they point along the line of interaction, opposite to each other.

Option d: If this option says the net force on each body is zero, that would only be true if the bodies are not accelerating due to the interaction or if other external forces cancel, which is not a general statement about the pair itself. In the pure interaction between two bodies, the two forces are equal and opposite, but each body can still experience a nonzero net force from the interaction alone.

In summary, the universally true statement for any two-body interaction is that the forces have the same magnitude (and opposite directions), which aligns with option c. The other options misstate the relationship by implying unequal magnitudes, same-direction forces, or incorrect implications about net forces.

Consider Stop To Think 13.2, reproduced below. Which is the correct answer ? Please read the question carefully, you are asked to compare the magnitude of the force exerted on body 2 by body 1 to the magnitude of the force exerted on body 1 by body 2. 单项选择题

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