Newton's Third Law: Action-Reaction Force Pairs

Steps:

• Recall Newton's third law: For every action force, there is an equal and opposite reaction force acting on a different object.
• Identify pairs where forces act between two interacting objects, not on the same object.
• Eliminate options where both forces act on one object, as those are balanced forces, not action-reaction pairs.
• Select the option showing mutual interaction between two bodies.

Why B is correct:

• The gravitational attraction between Earth and Moon forms an action-reaction pair, where Earth pulls Moon and Moon pulls Earth equally but oppositely, per Newton's third law.

Why the others are wrong:

• A: Resisting and driving forces both act on the car, representing balanced forces on one object, not an action-reaction pair.
• C: Support force and weight both act on the box, as equilibrium forces on the same object.
• D: Lift and weight both act on the airplane, balancing each other on one body.

Final answer: B