NCERT  ·  Physics  ·  Class IX  ·  Ch.8

Force and Laws of Motion
MCQ Master Series

Balanced & Unbalanced Forces · Newton’s Laws · Inertia · Momentum · Impulse

🔥 50 Questions
⏱ 40 min Suggested
📊 3 Tiers
🗂 5 Topics
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Question Intelligence

Quiz Analytics

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

📈 Distribution Overview

50
Total Questions
Concept Check (NCERT)
34
Law-based Reasoning
12
Simple Numericals / Impact
4

🗂 Topic Coverage

Balanced & Unbalanced Forces
10%
Newton’s Three Laws & Examples
32%
Inertia & Mass
14%
Momentum, Impulse & Impact
28%
Conservation of Momentum & Motion
16%
34
Concept Check (NCERT)
12
Law-based Reasoning
4
Simple Numericals / Impact
Conceptual Framework

Key Concept Highlights

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

⚖️
Balanced vs Unbalanced Forces
Balanced forces have zero net force and do not change the state of motion, while unbalanced forces produce acceleration and change the speed or direction of a body.
🛑
First Law & Inertia
Newton’s First Law, or the law of inertia, states that a body remains at rest or in uniform motion in a straight line unless acted upon by an external unbalanced force.
📦
Second Law & Definition of Force
Newton’s Second Law relates net force to the rate of change of momentum, and for constant mass it becomes F = ma, giving the quantitative definition and SI unit of force.
🔁
Third Law & Action–Reaction
Newton’s Third Law states that every action has an equal and opposite reaction, acting on two different bodies, explaining phenomena like recoil, walking and rocket propulsion.
🎯
Momentum, Impulse & Impact
Momentum is the product of mass and velocity, impulse is the product of force and time, and together they determine how much impact a moving body produces during collisions.
🔄
Conservation of Momentum
In an isolated system with no external force, the total momentum before interaction equals the total momentum after, a key principle used in collision and recoil problems.
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.

  • Force precise recall — vague conceptual understanding gets exposed immediately
  • Train elimination logic, a critical skill in JEE where partial knowledge suffices
  • Mirror the exact format of CBSE Board objective sections and JEE Main Paper 1
  • Build exam temperament: decisive, timed, confident decision-making
  • Reveal misconceptions that long-answer formats often mask
  • Provide instant feedback loops — every wrong answer is a targeted study pointer
~10–12%

of Class 9 Science Physics weightage under “Force and Laws of Motion” in school exams, periodic tests and final assessments.

Quick Reference

Important Formula Capsules

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

Newton’s Second Law (General)
\[ \vec{F}_{\text{net}} = \dfrac{\Delta \vec{p}}{\Delta t} \]
Force for Constant Mass
\[ F = m a \]
Momentum Definition
\[ p = m v \]
Impulse Definition
\[ J = F \Delta t \]
Impulse–Momentum Relation
\[ J = \Delta p \]
Conservation of Momentum
\[ p_{\text{total, initial}} = p_{\text{total, final}} \]
Learning Outcomes

What You Will Learn

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

01 Distinguish between balanced and unbalanced forces and relate them to the presence or absence of acceleration.
02 State Newton’s three laws of motion and match everyday examples like bus jerks, walking, rocket motion and recoil to the correct law.
03 Define inertia, momentum, force and impulse, recall their SI units and identify which physical quantity controls the impact of a moving body.
04 Use p = mv and F = ma to solve simple numerical questions on momentum, force and acceleration for given mass and velocity changes.
05 Apply the law of conservation of momentum to situations like gun–bullet, person jumping from a boat and colliding bodies in an isolated system.
06 Explain why seat belts reduce injury, why dust comes out when a carpet is beaten and why heavier objects have greater inertia.
07 Classify forces into contact and non-contact types and reason why action–reaction pair does not cancel for motion of objects like a horse–cart system.
Exam Preparation

Strategy & Preparation Tips

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

Step 01
Pair Each MCQ with a Law
For every question, first decide whether it is about inertia, F = ma or action–reaction; this single step often gives the right option immediately.
Step 02
Track Quantities & Units
Label mass, velocity, time and force clearly so you can pick the right formula (p = mv, F = ma or J = FΔt) and carry correct SI units like N and kg·m/s.
Step 03
Think in Terms of Momentum
Whenever a question mentions impact, collision or recoil, mentally shift to momentum and its conservation instead of only thinking about forces.
Step 04
Use Everyday Intuition Carefully
Relate examples—bus start/stop, boat push, walking, rocket—to their underlying laws but always check that the described action–reaction pair acts on different bodies.
Step 05
Estimate Before Calculating
For numericals, quickly estimate whether your final value of momentum, force or acceleration is reasonable in magnitude before locking an MCQ option.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Force and Laws of Motion Quiz
🎯 Knowledge Check

Physics — 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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Frequently Asked Questions

Force is a push or pull on an object that can change its state of motion or shape.

Balanced forces are equal in magnitude and opposite in direction, producing no change in motion.

Unbalanced forces cause a change in the state of motion or shape of an object.

Sir Isaac Newton formulated the three laws of motion.

An object remains at rest or in uniform motion unless acted upon by an unbalanced external force.

Inertia is the tendency of an object to resist any change in its state of motion or rest.

The rate of change of momentum is directly proportional to the applied force and occurs in its direction.

For every action, there is an equal and opposite reaction.

Momentum is the product of an object’s mass and velocity, given byp=m×vp = m \times vp=m×v.

The SI unit of force is the newton (N).

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.

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