NCERT Solutions for Class 11 Physics Chapter 2 Motion In A Straight Line - FREE PDF Download
FAQs on NCERT Solutions for Class 11 Physics Chapter 2 Motion In A Straight Line
1. What topics are covered in the NCERT Solutions for Class 11 Physics Chapter 2 Motion in a Straight Line?
The NCERT Solutions for Class 11 Physics Chapter 2 Motion in a Straight Line cover key concepts including:
- Kinematics and motion along a straight path
- Difference between distance and displacement
- Speed, velocity, and acceleration (average and instantaneous)
- Uniform and non-uniform motion
- Kinematic equations of motion
- Graphical representation of motion (x-t, v-t, a-t graphs)
- Conceptual and numerical problems as per the latest CBSE 2025–26 syllabus
2. How are distance and displacement different, as explained by NCERT Solutions for Class 11 Physics Chapter 2?
In Class 11 Physics Chapter 2 Solutions:
- Distance is the total length of the actual path travelled — a scalar quantity, always positive.
- Displacement is the shortest straight-line distance between start and end points — a vector, can be positive, negative, or zero.
- Displacement is always less than or equal to distance; they are equal only for straight-line, one-way motion.
3. What is the difference between speed and velocity in Motion in a Straight Line according to NCERT Solutions?
According to the NCERT Solutions for Class 11 Physics Chapter 2:
- Speed is the rate at which distance is covered; it is a scalar and always non-negative.
- Velocity is the rate of change of displacement with time; it is a vector and can be positive, negative, or zero.
4. What types of questions are included in the NCERT Solutions for Class 11 Physics Chapter 2?
The NCERT Solutions for Class 11 Physics Chapter 2 provide:
- Stepwise answers to all textbook exercises
- Conceptual short-answer and long-answer questions
- Numerical problems based on kinematic equations
- Graph-based questions (plotting, interpretation)
- Reasoning and HOTS (Higher Order Thinking Skills) as per CBSE exam pattern
5. How do NCERT Solutions for Class 11 Physics Chapter 2 help students prepare for CBSE exams?
The solutions provide:
- Detailed, CBSE-aligned explanations for each question
- Stepwise problem-solving methods as expected in board exams
- Clarity on concepts and their application through solved examples
- Coverage of all NCERT textbook exercises as per current CBSE 2025–26 guidelines
6. What is uniform and non-uniform motion according to NCERT Solutions for Class 11 Physics Chapter 2?
Uniform motion refers to motion with constant speed in a straight line, covering equal distances in equal time intervals. Non-uniform motion involves variable speed, resulting in unequal distances in equal intervals of time. These concepts are illustrated through both definitions and numerical examples in the chapter.
7. Why do the NCERT Solutions for Class 11 Physics Chapter 2 focus on graph-based questions?
Graphs like position-time (x-t), velocity-time (v-t), and acceleration-time (a-t) are critical for understanding motion conceptually and visually. The NCERT Solutions emphasize graph plotting and interpretation because:
- CBSE exams frequently ask such questions
- They test deeper conceptual understanding
- They help students connect mathematical relations with real-world motion
8. What are the main kinematic equations listed in NCERT Solutions for Class 11 Physics Chapter 2?
The core kinematic equations covered are:
- v = u + at (final velocity)
- x = ut + (1/2)at2 (displacement)
- v2 = u2 + 2ax (velocity-displacement relation)
Where v = final velocity, u = initial velocity, a = acceleration, x = displacement, t = time.
9. How do NCERT Solutions for Class 11 Physics Chapter 2 explain average speed and average velocity for a round trip?
For a round trip (e.g., going to a point and returning), average velocity can be zero if displacement is zero, but average speed remains positive as it is total distance/time. NCERT Solutions guide students to correctly apply concepts, avoiding common calculation mistakes in such scenarios.
10. Can an object have zero speed but non-zero acceleration? Explain using Motion in a Straight Line NCERT Solutions.
Yes, as detailed in NCERT Solutions. For example, when a ball is thrown straight up, at the highest point its speed is zero but acceleration due to gravity is still acting. This clarifies a common cause of confusion in CBSE Physics exams.
11. What is rectilinear motion as described in NCERT Solutions for Class 11 Physics Chapter 2?
Rectilinear motion is another term for motion in a straight line. The solutions use both terms to help students connect textbook wording with common exam phrasing.
12. What are the types of one-dimensional motion covered in Motion in a Straight Line NCERT Solutions?
The two main types of one-dimensional motion in NCERT Solutions are:
- Uniform motion (constant velocity)
- Non-uniform or accelerated motion (velocity changes due to acceleration or deceleration)
13. How does the NCERT Solution for Class 11 Physics Chapter 2 help clear misconceptions about acceleration’s sign and direction?
Solutions emphasize that acceleration's sign depends on chosen direction. Positive acceleration with negative velocity means slowing down, not speeding up. This is commonly misunderstood, and the chapter clarifies with examples and FUQs for deeper understanding.
14. Why is the magnitude of instantaneous velocity always equal to instantaneous speed as per NCERT Solutions?
Instantaneous speed is the magnitude of instantaneous velocity. Both reflect how quickly position changes at a specific instant; direction does not affect magnitude at that instant. This core idea is highlighted for conceptual clarity for CBSE exams.
15. How do NCERT Solutions help students avoid errors in interpreting motion graphs for CBSE Class 11 Physics Chapter 2?
Solutions reinforce:
- Reading the axes correctly (time versus displacement, velocity, acceleration)
- Understanding that negative slopes mean negative velocities or deceleration
- Recognizing when a graph does not physically represent valid one-dimensional motion (e.g., two positions at the same instant)

















