Question
2. Which of the following is an example of Newton's Third Law? A. A ball rolling downhill. B. A person pushing a wall, and the wall pushing back. C. A car speeding up. D. A leaf falling from a tree. thingy cannot be created or destroyed.
Solution
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Marilyn
Master ยท Tutor for 5 years
Answer
The correct answer is **B. A person pushing a wall, and the wall pushing back.**Here's why:Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.* **A. A ball rolling downhill:** This demonstrates gravity and potentially friction, but not Newton's Third Law.* **B. A person pushing a wall, and the wall pushing back:** The person exerts a force on the wall (action), and the wall exerts an equal and opposite force back on the person (reaction). This is a clear example of Newton's Third Law.* **C. A car speeding up:** This demonstrates acceleration due to a force, but doesn't specifically illustrate the equal and opposite reaction aspect of Newton's Third Law.* **D. A leaf falling from a tree:** This demonstrates gravity, but not Newton's Third Law.The statement "thingy cannot be created or destroyed" refers to the Law of Conservation of Mass (or in more modern physics, the Law of Conservation of Mass-Energy), which is a separate principle from Newton's Third Law.