Newton's Third Law of Motion.
Explanation
The phenomenon described is a classic illustration of the interaction of forces between two bodies, governed by the fundamental laws of mechanics.
Analysis:
- Newton's Third Law of Motion states that "to every action, there is always an equal and opposite reaction."
- When the sailor jumps forward out of the boat, they apply a force on the boat in the backward direction. This is the action force.
- Simultaneously, the boat exerts an equal and opposite force on the sailor in the forward direction. This is the reaction force, which propels the sailor to the shore.
- Because the boat is floating on water (which offers relatively low friction compared to solid ground), the backward force exerted by the sailor causes the boat to move backward.
Incorrect Options:
- Inertia of rest refers to the resistance of an object to change its state of rest. While relevant to the boat's initial state, it does not explain the active backward acceleration caused by the jump.
- Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction or physical transformation, which is unrelated to the dynamics of force and motion in this context.
- Balanced forces imply that the net force on an object is zero, resulting in no change in motion. Since the boat accelerates backward, the forces acting on it are unbalanced.
Key Takeaway:
Newton's Third Law of Motion explains that forces always exist in action-reaction pairs; the backward movement (recoil) of a boat is the direct result of the force applied by the person jumping forward.