Question

Newton's Third Law: Action & ReactionEvery time your cat’s paw hits her toy string, it swings away from her. How does this demonstrate Newton’s third law of motion?Objects with mass, such as your cat’s paw and toy string, will require inertia.Objects in action, such as the string toy, will experience force.For every motion from your cat’s paw, there is unbalanced inertia from the string.For every action your cat makes, there is an equal and opposite reaction from the string

Answer 1

The best choice is the last one: "For every action your cat makes, there is an equal and opposite reaction from the string."

Why: when the cat’s paw pushes the toy, the paw exerts a force on the string (the action). The string exerts an equal‑magnitude force in the opposite direction on the paw (the reaction). Those two forces form a force pair acting on different objects, so they do not cancel. The string accelerates away because that force on the string produces acceleration according to F = ma. (Inertia — the tendency to resist changes in motion — is related to Newton’s first law, not the third law itself.)