What does Newton's third law of motion state?

• A. For every action, there is an equal and opposite reaction
• B. Every object in motion stays in motion
• C. The force acting on an object is equal to its mass times its acceleration
• D. Energy cannot be created or destroyed

Answer: (A)

Newton's third law of motion states that for every action, there is an equal and opposite reaction. This principle highlights the idea that forces always occur in pairs. When one object exerts a force on a second object, the second object exerts an equal but opposite force back on the first object. This interaction is fundamental in understanding the dynamics of motion and forces in a system.

For instance, when you push against a wall, you exert a force on the wall, and simultaneously, the wall exerts an equal and opposite force back against your hand. This law helps explain many everyday phenomena, such as walking (where you push backward against the ground, and the ground pushes you forward) or how rockets launch (where exhaust gases are expelled downward, resulting in an upward thrust due to reaction).

Understanding this law is crucial for analyzing interactions between objects and comprehending the conservation of momentum in various physical systems. Other statements presented in the options describe concepts related to motion, force, and energy but do not pertain to Newton's third law specifically.