Which one of these is true about motion? (A) Motion is relative (B) Motion is not relative (C) Something is not in motion if its position respect to the observer changes with time (D) Both (A) and (B)
Answer (1)
To answer the question about motion, let's first understand what motion is. Motion is defined as the change in position of an object with respect to time. Whether an object is considered in motion or not depends on the point of reference used to observe that object.
Let's analyze the choices given:
(A) Motion is relative: This is true. When we say motion is relative, we mean that whether or not an object is in motion depends on the observer's frame of reference. For example, if you are sitting in a moving train and you look at another train moving at the same speed and direction, it may appear stationary to you. However, to an observer standing outside on the platform, both trains are in motion.
(B) Motion is not relative: This is incorrect. Motion is always relative to something—a benchmark, usually another object or the surrounding environment.
(C) Something is not in motion if its position with respect to the observer changes with time: This statement is incorrect. An object is considered in motion if its position changes with respect to time relative to a defined reference point.
(D) Both (A) and (B): This cannot be true because options (A) and (B) contradict each other.
Based on the analysis, the correct answer is (A) Motion is relative. This emphasizes the importance of the observer's perspective in determining whether an object is in motion or not.
