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NCERT Solutions for Class 11 Physics Ch-2: Motion in a Straight Line
NCERT Solutions for Class 11 Physics Chapter 2 Motion in a Straight Line explains the concepts of position, displacement, velocity and acceleration for objects moving along a single direction, along with the kinematic equations of uniformly accelerated motion.
Overview of Topics & Subtopics
Important Questions and Answers
Q1: What is the difference between distance and displacement?
Answer: Distance is the total path length covered by an object during its motion and is always positive, whereas displacement is the shortest straight-line distance between the initial and final positions, having both magnitude and direction (a vector quantity).
Q2: Define average velocity and average speed. Can average speed be greater than the magnitude of average velocity?
Answer: Average velocity is the total displacement divided by the total time taken, while average speed is the total distance travelled divided by the total time taken. Yes, average speed can be greater than the magnitude of average velocity when the path taken is not a straight line, since distance travelled is always greater than or equal to the magnitude of displacement.
Q3: Write the three kinematic equations for uniformly accelerated motion.
Answer: For an object with initial velocity u, final velocity v, acceleration a, and time t, the three equations are: v = u + at; s = ut + (1/2)at²; and v² = u² + 2as, where s is the displacement.
Q4: What does the slope of a velocity-time graph represent, and what does the area under it represent?
Answer: The slope of a velocity-time graph represents the acceleration of the object, while the area enclosed between the graph and the time axis represents the displacement of the object during that time interval.
Q5: Can an object have zero velocity and still be accelerating?
Answer: Yes. For example, when a ball is thrown vertically upward, at the highest point its velocity becomes momentarily zero, but the acceleration due to gravity continues to act on it throughout its motion, including at that instant.
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