NCERT · Science · Ch.8

Force and Laws of Motion
MCQ MASTER SERIES

Newton's Laws · Inertia · Momentum · Impulse · Conservation of Momentum

⚡ Start Quiz 📊 Analytics
50
Total Questions
30 min
Suggested Time
3
Difficulty Tiers
5
Core Topics
Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Board
25
State Board
16
Olympiad Level
9

🗂 Topic Coverage

Newton's First Law & Inertia
20%
Newton's Second Law
26%
Newton's Third Law
18%
Linear Momentum
18%
Conservation of Momentum
18%
25
CBSE Board
16
State Board
9
Olympiad Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

😴
Newton's First Law
An object remains at rest or in uniform motion unless acted upon by an external net force. Defines inertia (resistance to change in state) and force. Also called the Law of Inertia.
📐
Newton's Second Law
Force = rate of change of momentum. F = ma (for constant mass). SI unit of force: newton (N = kg·m/s²). Net force causes acceleration in the direction of the applied force.
🔄
Newton's Third Law
For every action there is an equal and opposite reaction. Action-reaction forces act on DIFFERENT bodies. They are equal in magnitude and opposite in direction.
🏋️
Linear Momentum
p = mv. Vector quantity, direction = velocity direction. SI unit: kg·m/s. Newton's second law in complete form: F = Δp/Δt = rate of change of momentum.
⚖️
Conservation of Momentum
Total momentum of an isolated system remains constant. Applies in all collisions. Before collision: p₁ + p₂ = After collision: p₁' + p₂'. Used in rocket propulsion.
⚡
Impulse
Impulse = Force × time = change in momentum. F·Δt = Δp. Explains why airbags, cushions, and follow-through in sports reduce injury — they increase contact time, reducing force.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

🎯

Precision Recall

Vague understanding doesn't survive MCQs — they force exact conceptual clarity.

⚡

Exam Format Mirror

Direct simulation of CBSE Board objective sections and JEE Main Paper 1 structure.

📊

Exam Weight

~12%

of CBSE Class IX Science — Newton's second law numericals are guaranteed in board exams

Quick Reference

Important Formula Capsules

5 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Newton's Second Law
\[ F = ma = \dfrac{\Delta p}{\Delta t} \]
Linear Momentum
\[ p = mv \]
Impulse
\[ J = F \cdot \Delta t = \Delta p \]
Conservation of Momentum
\[ m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2 \]
Weight
\[ W = mg \quad (g = 9.8\ \text{m/s}^2) \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 State all three laws of motion and give one real-life example for each
02 Define inertia, momentum, and impulse with SI units
03 Apply F = ma to calculate force, mass, or acceleration
04 Derive the law of conservation of momentum from Newton's third law
05 Explain practical applications: seat belts, airbags, rocket propulsion, recoil of gun
06 Distinguish mass from weight and calculate weight given mass
Exam Preparation

Strategy & Preparation Tips

4 evidence-based strategies to maximise your score in CBSE Boards and JEE.

Step 01
Three Laws in Three Sentences
1st = no force → no change. 2nd = F=ma (quantitative). 3rd = action-reaction pair. Write one real-life example for each. CBSE always asks "state and explain with example."
Step 02
Momentum Numericals
Before and after collision: write p = mv for each object, then equate totals. Common error: forgetting to use final velocity (v) not initial (u) after collision.
Step 03
Action-Reaction Trap
MCQ trap: "action and reaction cancel each other." WRONG — they cancel only if on the same body. They act on DIFFERENT bodies. This distinction is a 2-mark CBSE question.
Step 04
Impulse Applications
Link airbag/seat belt to impulse = F·t = Δp. If Δp is constant, increasing t decreases F. This 2-line explanation earns 2 marks in board exams.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Force and Laws of Motion Quiz
🎯 Knowledge Check

Science — Force And Laws Of Motion

50 Questions Class 9 MCQs
1
Which of the following is a balanced force?
2
Newton’s First Law of Motion is also called:
3
An object continues in its state of rest or uniform motion unless acted upon by an external force. This is:
4
Inertia of motion means:
5
The unit of force is:
6
Which of these is an example of Newton’s First Law?
7
Momentum is defined as:
8
SI unit of momentum is:
9
Rate of change of momentum is equal to:
10
Newton’s Second Law of Motion gives:
11
Which one is an example of Newton’s Third Law?
12
Newton’s Third Law states:
13
The recoil of a gun is an example of:
14
A ball hitting a bat and bat pushing the ball is an example of:
15
The property of an object to resist change in its state is called:
16
A passenger falls backward when a bus suddenly accelerates. This is due to:
17
The SI unit of force is named after:
18
Momentum is a:
19
When two bodies collide, total momentum is conserved if:
20
Law of conservation of momentum states:
21
Which of the following shows inertia of direction?
22
A cricketer lowers his hands while catching a ball to:
23
A body of mass 5 kg has momentum 25 kg·m/s. Its velocity is:
24
A body of mass 10 kg is moving with velocity 2 m/s. Its momentum is:
25
A force of 50 N is applied on a body of mass 10 kg. The acceleration produced is:
26
Which of the following is not an example of Newton’s Third Law?
27
A rocket works on the principle of:
28
Which law defines force quantitatively?
29
The SI unit of force is equivalent to:
30
A person jumping from a boat pushes the boat backward. This is due to:
31
Which of the following has maximum inertia?
32
Which physical quantity determines the impact produced by a moving body?
33
A body continues to move uniformly unless:
34
The product of force and time is called:
35
The unit of impulse is:
36
Which law explains why we wear seat belts in cars?
37
A man pushing a wall experiences a reaction force. The wall does not move because:
38
Which of these is not a contact force?
39
When a carpet is beaten, dust particles come out due to:
40
The acceleration produced in a body depends on:
41
A bullet of mass 50 g moving with velocity 100 m/s has momentum:
42
A force of 20 N acts on a mass of 2 kg. The acceleration is:
43
Walking is possible because of:
44
Which law explains rocket propulsion?
45
The rate of change of velocity is called:
46
The inertia of an object depends on:
47
An object at rest can be moved by:
48
When a horse pulls a cart, the cart moves because:
49
Which is an example of conservation of momentum?
50
Which of the following quantities remains constant in an isolated system of colliding bodies?
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ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
Sharing this chapter
Force And Laws Of Motion | Science Class 9 | Academia Aeternum
Force And Laws Of Motion | Science Class 9 | Academia Aeternum — Complete Notes & Solutions · academia-aeternum.com
The chapter “Force and Laws of Motion” is one of the most important topics in Class 9 Physics. It introduces the fundamental ideas of force, inertia, momentum, and Newton’s three laws of motion, which form the basis of mechanics. To help students strengthen their understanding and prepare for CBSE exams, school tests, and competitive assessments, we have prepared 50 multiple choice questions (MCQs) with answers and detailed explanations. These MCQs cover every important concept from the…
🎓 Class 9 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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Frequently Asked Questions

The SI unit of momentum is kg·m/s.

One newton is the force that produces an acceleration of 1 m/s² in an object of mass 1 kg.

F=m×aF = m \times aF=m×a— whereFFFis force,mmmis mass, andaaais acceleration.

Acceleration depends directly on the applied force and inversely on the object’s mass.

Due to inertia, the passenger's body resists the forward motion.

Due to inertia of motion, the upper part of the passenger’s body continues moving forward.

Running increases momentum, helping them cover a greater distance.

Force is directly proportional to acceleration (F?aF ? aF?a).

The forces balance each other, and the object remains in uniform motion or rest.

The total momentum of a system remains constant when no external force acts on it.

By expelling gases downward, which push the rocket upward due to action-reaction pairs.

To reduce pressure and distribute weight evenly for stability.

They are known as the fundamental laws describing motion and dynamics of objects.

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    Force and Laws of Motion — Learning Resources

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    ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
    Sharing this chapter
    Force And Laws Of Motion | Science Class 9 | Academia Aeternum
    Force And Laws Of Motion | Science Class 9 | Academia Aeternum — Complete Notes & Solutions · academia-aeternum.com
    The chapter “Force and Laws of Motion” is one of the most important topics in Class 9 Physics. It introduces the fundamental ideas of force, inertia, momentum, and Newton’s three laws of motion, which form the basis of mechanics. To help students strengthen their understanding and prepare for CBSE exams, school tests, and competitive assessments, we have prepared 50 multiple choice questions (MCQs) with answers and detailed explanations. These MCQs cover every important concept from the…
    🎓 Class 9 📐 Science 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
    Share on
    WhatsApp
    Telegram
    X / Twitter
    Facebook
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    Threads
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    Quora
    Discord
    Reddit
    Email
    academia-aeternum.com/class-9/science/force-and-laws-of-motion/mcqs/ Copy link
    💡
    Exam tip: Sharing chapter notes with your study group creates a reinforcement loop. Teaching a concept is the fastest path to mastering it.

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