MP Board Solutions Class 9 Science Chapter 7 – Motion
MP Board Solutions for Class 9 Science Chapter 7 – Motion are essential for understanding key Physics concepts in the MPBSE curriculum. These well-structured answers help students grasp topics like distance and displacement, speed, velocity, acceleration, and graphical representation of motion. Designed as per the latest syllabus, these solutions strengthen conceptual clarity and improve exam preparation. Ideal for revision and practice, they encourage logical thinking and scientific understanding, making them a valuable study tool for scoring well in Class 9 Science exams.
MP Board Solutions Class 9 Science – Motion – Exercise Images
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Motion – Important Questions with Answers
1. Define motion.
Answer: Change in position of an object over time relative to a reference point.
2. Differentiate distance and displacement.
Answer: Distance is total path length; displacement is shortest straight-line between start and end.
3. SI unit of speed and displacement.
Answer: Metre (m).
4. Define speed.
Answer: Distance travelled per unit time (m/s).
5. What is velocity?
Answer: Displacement per unit time in a given direction.
6. Define acceleration.
Answer: Rate of change of velocity with time (m/s²).
7. Equations of motion under uniform acceleration.
Answer: v = u + at, s = ut + ½at², v² = u² + 2as.
8. What does the slope of a distance-time graph represent?
Answer: Speed.
9. What does area under a velocity-time graph depict?
Answer: Displacement.
10. Define uniform and non-uniform motion.
Answer: Uniform: equal distances in equal time. Non-uniform: unequal distances in equal time.
11. What is retardation?
Answer: Negative acceleration (reduction in velocity).
12. Calculate acceleration when velocity increases from 20 to 50 m/s in 10 s.
Answer: (50–20)/10 = 3 m/s².
13. Find distance covered in 5 s by a body with u=0, a=2 m/s².
Answer: s = ½×2×5² = 25 m.
14. Instantaneous vs average speed.
Answer: Instantaneous: speed at a moment. Average: total distance/total time.
15. Scalar vs vector: speed and velocity.
Answer: Speed is scalar; velocity is vector.
16. When can displacement be zero but distance non-zero?
Answer: Circular motion returning to starting point.
17. Define free fall motion.
Answer: Motion under only gravitational force (uniform acceleration).
18. Value of g.
Answer: Approximately 9.8 m/s².
19. Motion of a car stopping: falls forward because?
Answer: Inertia of motion makes body continue moving when the vehicle stops.
20. A body moves at 10 m/s for 15 s. Distance?
Answer: 10 × 15 = 150 m.
21. A car accelerates at 2 m/s². If it moves from 0 to 10 s at u=0, what is displacement?
Answer: s = ½ × 2 × 10² = 100 m.
22. What is instantaneous velocity?
Answer: Velocity at a specific instant.
23. Graph of non-uniform motion on distance-time plot?
Answer: Non-linear curve.
24. If an object’s velocity reduces from 20 to 0 in 4 s, what is retardation?
Answer: (0–20)/4 = –5 m/s².
25. When is motion considered accelerated?
Answer: When velocity changes over time.
Motion introduces how and why objects move. Students learn about distance, displacement, speed, velocity, and acceleration through simple observations—like a bullock cart, a train, or a flowing river. Equations of motion and graphical analysis equip students to calculate motion. This chapter builds the analytical framework needed for future physics topics and practical applications like transport, machinery, and sports.
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