ASVAB · Physics

What is Newton's Third Law of Motion?

Correct answer

For every action, there is an equal and opposite reaction — if object A exerts a force on object B, object B exerts an equal force in the opposite direction on object A

  1. A Objects in motion stay in motion
  2. B Force equals mass times acceleration
  3. C For every action, there is an equal and opposite reaction — if object A exerts a force on object B, object B exerts an equal force in the opposite direction on object A
  4. D The heavier the object, the less it accelerates

Why this is the answer

NEWTON'S THREE LAWS: First Law (Inertia): Objects at rest stay at rest; objects in motion stay in motion, unless acted on by a net force. Second Law (F=ma): Force = Mass × Acceleration; more force = more acceleration; more mass = less acceleration for the same force. Third Law (Action-Reaction): For every action force, there is an equal and opposite reaction force. EXAMPLES of Third Law: Rocket propulsion (exhaust pushes back, rocket pushes forward); walking (foot pushes back on ground, ground pushes foot forward); recoil when firing a weapon (bullet goes forward, weapon kicks backward).
Source: ASVAB GS, Physics — Newton's Laws

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