How do action-reaction pairs relate to Newton's third law in a push-pull scenario?

How do action-reaction pairs relate to Newton's third law in a push-pull scenario?

• A. They are equal and opposite forces acting on the same body
• B. They are equal and opposite forces acting on two different bodies
• C. They occur only in gravitational interactions
• D. They are unrelated forces

Answer: (B)

Action-reaction pairs follow Newton's third law: the forces are equal in magnitude and opposite in direction, and they act on two different objects. In a push-pull setup, when you push on something, that object pushes back on you with the same strength in the opposite direction. Because the two forces act on two separate bodies, they form a paired interaction rather than cancelling out on a single object. If the forces acted on the same body, they wouldn’t be the third-law pair—they’d just be internal forces within that body and wouldn’t describe the two-object interaction. This law applies to all interactions, not just gravity, so it covers contact forces, friction, and others as well.

Action-reaction pairs follow Newton's third law: the forces are equal in magnitude and opposite in direction, and they act on two different objects. In a push-pull setup, when you push on something, that object pushes back on you with the same strength in the opposite direction. Because the two forces act on two separate bodies, they form a paired interaction rather than cancelling out on a single object. If the forces acted on the same body, they wouldn’t be the third-law pair—they’d just be internal forces within that body and wouldn’t describe the two-object interaction. This law applies to all interactions, not just gravity, so it covers contact forces, friction, and others as well.