Class 9
Science
Chapter 6
Exploration (latest NCERT)
How Forces Affect Motion
Free NCERT practice questions for Class 9 Science, Chapter 6 — 81 questions across MCQs, short-answer, long-answer, numericals and more. Download a printable PDF worksheet in seconds. No signup, no ads, no paywall.
What this chapter covers
Class 9 Science Chapter 6 'How Forces Affect Motion' from NCERT Exploration presents Newton's three laws of motion. Students learn inertia, the F = ma relationship, momentum and impulse, and the equal-and-opposite reaction law. Many numerical problems exercise unit-conversion (N, kg, m/s) and graphical reasoning (v-t graphs, area under curve).
Key topics in this chapter
- Newton's three laws of motion
- Inertia and mass
- F = ma and unit conversions
- Momentum and impulse
- Action-reaction pairs
Sample questions from this chapter
Here are 6 real questions students will encounter when they generate a worksheet for this chapter. Every question includes the answer.
MCQ
Medium
1 mark
If no net force acts on a moving object, it will:
(a) Stop immediately
(b) Slow down
(c) Continue moving with constant velocity
(d) Speed up
Answer: Continue moving with constant velocity
Short Answer
Medium
3 marks
State Newton's second law and write its formula.
Answer: • When a net force acts, an object accelerates in the direction of the force.
• The acceleration is proportional to the force and inversely proportional to mass.
• Formula: F = ma.
Fill in the Blank
Easy
1 mark
Newton's first law is also called the law of __________.
Answer: inertia
Numerical
Medium
2 marks
In a boat race, 95 oarsmen row forward and 5 row backward by mistake. Each applies 200 N. Find the net force on the boat.
Answer: • Forward force = 95×200 = 19000 N.
• Backward force = 5×200 = 1000 N.
• Net force = 19000 − 1000 = 18000 N (forward).
Very Short
Easy
1 mark
State Newton's first law of motion.
Answer: An object stays at rest or moves with constant velocity unless a net force acts on it.
True / False
Medium
1 mark
State True or False: If the net force on an object is zero, it must be at rest.
Answer: False. It can also move with constant velocity (Newton's first law).
Generate a worksheet with all 81 questions →
Frequently asked questions
What is included in Class 9 Science Chapter 6 (How Forces Affect Motion)?
This chapter has 81 NCERT-aligned practice questions covering all the concepts from the Exploration textbook's Chapter 6. Questions span easy, medium and hard levels across 10 different formats so students get a balanced practice set.
Are these questions based on the new NCERT Exploration textbook?
Yes. Every question on Practico for Class 9 Science is mapped directly to the latest NCERT Exploration textbook (the one CBSE schools are using now). The chapter numbers and chapter titles match the textbook exactly.
How many questions can I practice from this chapter?
81 questions are available right now. You can pick how many you want at a time — generate 10 quick MCQs, a 30-question worksheet, or a full exam-style mix. Each generation gives you a different random set.
Can I download a free PDF worksheet for How Forces Affect Motion?
Yes — completely free, no sign-up required. Pick this chapter, choose the number of questions and types you want, and download a printable PDF (with or without answers) in one click.
What question types are available?
This chapter has assertion reason, fill blank, image, long, match, mcq, numerical, short, true false, very short. You can mix any combination, or filter to just the type you want to practice — for example, only numericals to drill calculation, or only short-answer questions for exam revision.
Is Practico aligned with CBSE exam patterns?
Yes. Practico questions are tagged by marks (1, 2, 3, 5) and by difficulty (Easy/Medium/Hard) just like CBSE exam blueprints, so you can build a worksheet that mirrors a real unit test or annual exam.