MP Board Solutions Class 9 Science Chapter 8 – Force and Laws of Motion
MP Board Solutions for Class 9 Science Chapter 8 – Force and Laws of Motion are essential for understanding key Physics concepts in the MPBSE curriculum. These well-structured answers help students grasp topics like Newton’s laws of motion, inertia, mass, momentum, and their applications. 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 – Force and Laws of Motion – Exercise Images
Experience Science Like Never Before – With AR!
Understanding Force and Laws of Motion is now more exciting and immersive! With the NAITRI App, you can explore complex science concepts through Augmented Reality (AR). Experience forces act, collisions occur, and Newton’s laws in action — right in front of you. Our AR-powered lessons make learning interactive, 3D, and fun, helping you retain concepts better and enjoy every topic.
Visualize . Interact . Understand . The future of learning is here
Force and Laws of Motion – Important Questions with Answers
1. Define force.
Answer: A push or pull acting on a body, causing change in its motion.
2. SI unit of force.
Answer: Newton (N).
3. Difference between balanced and unbalanced force.
Answer: Balanced forces cause no change in motion; unbalanced forces do.
4. Newton’s First Law.
Answer: An object remains at rest or moves uniformly unless acted upon by an external force.
5. Define inertia.
Answer: Tendency to resist motion change.
6. On what does inertia depend?
Answer: Mass of the object.
7. State Newton’s Second Law.
Answer: F = ma (force equals mass times acceleration).
8. Define momentum.
Answer: Product of mass and velocity (kg·m/s).
9. State conservation of momentum.
Answer: Total momentum of a system remains constant if no external forces act.
10. Formula for momentum?
Answer: p = m × v.
11. Newton’s Third Law.
Answer: For every action there is an equal and opposite reaction.
12. Why does a gun recoil when fired?
Answer: Bullet’s forward action has an equal and opposite reaction on the gun.
13. Why do passengers jerk forward when bus stops suddenly?
Answer: Their bodies continue moving due to inertia of motion.
14. A 2 kg mass moving at 4 m/s is stopped in 2 s; force?
Answer: Δp = 8 kg·m/s, F = 8/2 = 4 N.
15. Define impulse.
Answer: Change in momentum (F × Δt).
16. Why do athletes take running start before long jump?
Answer: To build momentum needed for long jump.
17. Calculate force if mass=3 kg, a=2 m/s².
Answer: F = 6 N.
18. Is force scalar or vector?
Answer: Vector.
19. Define momentum and its unit?
Answer: p = m × v, unit kg·m/s.
20. Why do we use seat-belts in vehicles?
Answer: They provide external force to stop forward motion, reducing injury risk.
21. What does the slope of a momentum-time graph indicate?
Answer: Force.
22. Car accelerates from 0 to 20 m/s in 10 s; acceleration=?
Answer: a = 20/10 = 2 m/s².
23. Body with unbalanced forces experiences what?
Answer: Acceleration.
24. How rockets take off?
Answer: Gases expelled downward produce upward thrust (action–reaction).
25. A 0.5 kg ball moving at 10 m/s: momentum?
Answer: p = 5 kg·m/s.
Force and Laws of Motion explains the impact of forces on objects through Newton’s laws. Students explore concepts of inertia, momentum, and action-reaction pairs using relatable examples like pushing a cart or hitting a ball. These laws are the foundation of mechanics, helping students understand how vehicles, tools, and machines work—crucial for rural innovation and industrial development in MP.
Related Chapters You May Like
Download Naitri App
Easy, Visual Learning — Right on Your Phone
Learn with Augmented Reality! The Naitri app makes CBSE and MP Board concepts interactive and fun — even in low-resource settings. Watch lessons, complete homework, take tests, and track progress — all in one place. Anytime. Anywhere.
Available on
