NCERT · Physics · Ch.4

Force and Laws of Motion
MCQ MASTER SERIES

Newton’s Laws · Inertia · Momentum · Impulse · Friction · Circular Motion Basics

⚡ Start Quiz 📊 Analytics
50
Total Questions
40 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
Concept Check (NCERT)
30
Boards-Level Reasoning
14
Numerical / Graph HOTS
6

🗂 Topic Coverage

Newton’s Laws & Inertia
30%
Momentum & Impulse
26%
Friction & Its Uses
20%
Force, Acceleration, Units
14%
Graphs & Everyday Effects
10%
30
Concept Check (NCERT)
14
Boards-Level Reasoning
6
Numerical / Graph HOTS
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 & Inertia
First law explains how bodies remain at rest or in uniform motion unless an unbalanced force acts, introducing inertia as the tendency to resist change in motion.
📦
Force, Acceleration & Second Law
Second law links unbalanced force with rate of change of momentum and, for constant mass, gives F = ma, providing the basic equation for motion under forces.
🔁
Action–Reaction & Third Law
Third law states that forces always occur in equal and opposite pairs on different bodies, explaining recoil of a gun, walking, swimming and rocket motion.
🎯
Momentum & Impulse
Momentum is the product of mass and velocity; impulse is the product of force and time and equals the change in momentum, represented by area under an F–t graph.
⚖️
Conservation of Momentum
In an isolated system with no external force, total momentum before and after collision remains constant, a key idea in collision and recoil problems.
🛷
Friction & Its Role
Static, limiting and rolling friction oppose relative motion; though they cause bodies to slow down, friction is also essential for walking, braking and gripping surfaces.
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

~8–10%

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.

Force–Mass–Acceleration
\[ F = m a \]
Momentum
\[ p = m v \]
Impulse Definition
\[ J = F \Delta t \]
Impulse–Momentum Relation
\[ J = \Delta p \]
Conservation of Momentum
\[ p_{\text{total, initial}} = p_{\text{total, final}} \]
Slope of p–t Graph
\[ F = \dfrac{\Delta p}{\Delta t} \]
Learning Outcomes

What You Will Learn

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

01 State Newton’s three laws of motion and explain inertia, action–reaction and the need for unbalanced force using everyday examples like buses and recoil.
02 Define force, momentum and impulse, know their SI units, and solve basic problems using F = ma, p = mv and J = FΔt.
03 Explain and apply the law of conservation of momentum to simple collisions and recoil situations in an isolated system.
04 Differentiate between static, limiting and rolling friction, identify which force opposes relative motion and describe situations where friction is useful or undesirable.
05 Interpret force–time and momentum–time graphs, relating area under F–t to impulse and slope of p–t to force.
06 Relate changes in stopping time, use of seat belts and large impact times to reduced forces in terms of impulse and momentum concepts.
07 Recognise the conditions under which laws of motion and momentum conservation are valid (Newtonian, non‑relativistic, inertial reference frames).
Exam Preparation

Strategy & Preparation Tips

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

Step 01
Secure All Key Definitions
Memorise precise statements of the three laws, momentum, impulse and friction types; many MCQs directly test correct wording and unit recognition.
Step 02
Link Laws to Daily Life
Practise questions on bus jerks, recoil, walking and rockets so you can quickly identify which law is being applied in conceptual reasoning items.
Step 03
Use Momentum & Impulse Templates
For collision and force–time problems, always start with p = mv and J = FΔt, then write “total momentum before = total momentum after” when no external force acts.
Step 04
Sort Out Friction Questions
Train yourself to decide whether static, limiting or rolling friction is acting and remember that static friction is self‑adjusting up to its limiting value.
Step 05
Read Graphs, Not Just Numbers
Remember: area under F–t graph gives impulse and slope of p–t graph gives force; examiners love to hide simple law-of-motion ideas inside small graph‑based MCQs.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Force and Laws of Motion Quiz
🎯 Knowledge Check

Physics — LAWS OF MOTION

50 Questions Class 11 MCQs
1
What does Newton’s First Law describe?
2
Inertia depends upon:
3
The SI unit of force is:
4
Which of the following is a vector quantity?
5
If net external force on a body is zero, the body:
6
Momentum of a body is defined as:
7
Impulse is equal to:
8
The unit of impulse is:
9
Which force always opposes relative motion?
10
Static friction:
11
Limiting friction acts when:
12
Rolling friction is:
13
Newton’s Second Law gives a measure of:
14
According to Newton’s Second Law:
15
If mass is constant, Newton’s Second Law becomes:
16
Action and reaction forces act:
17
Action and reaction forces are:
18
Which law explains recoil of a gun?
19
Conservation of momentum is valid when:
20
A bullet fired from a gun causes recoil because:
21
If two bodies collide in an isolated system, total momentum:
22
A heavier object requires more force to accelerate because:
23
When a bus suddenly stops, passengers lean forward due to:
24
The area under force–time graph represents:
25
If stopping time is increased, impact force:
26
Seat belts work on principle of:
27
Friction depends on:
28
Which force is self-adjusting?
29
A body of mass \(2\,\text{kg}\) accelerates at \(3\,\text{m/s}^2\). Force applied is:
30
Momentum of a stationary body is:
31
If velocity doubles, momentum:
32
Which of the following quantities remains conserved in collision?
33
In an elastic collision:
34
A force acting for short time with large magnitude is called:
35
Which quantity changes during impulse?
36
If no external force acts, the centre of mass:
37
Newton’s Third Law is responsible for:
38
A rocket moves forward because:
39
The force responsible for circular motion is:
40
If force is zero, acceleration is:
41
A body sliding on rough surface finally stops due to:
42
Friction is helpful in:
43
Which law explains conservation of momentum?
44
If mass increases and force remains same, acceleration:
45
The slope of momentum–time graph gives:
46
A constant force produces:
47
Momentum conservation fails when:
48
Which statement is incorrect?
49
A body of large mass is difficult to move because:
50
Laws of motion are valid in:
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Frequently Asked Questions

Newton's First Law states that a body remains at rest or in uniform straight-line motion unless acted upon by a net external force; this is called the law of inertia.

Newton's Second Law states that the rate of change of momentum of a body is proportional to the applied net force and takes place in the direction of the force, \(\vec{F} = \frac{d\vec{p}}{dt} = m\vec{a}\).

Newton's Third Law states that for every action there is an equal and opposite reaction; forces always occur in pairs acting on different bodies.

Inertia is the property of a body by virtue of which it resists any change in its state of rest or uniform motion in a straight line.

Linear momentum \(\vec{p}\) of a body is defined as the product of its mass and velocity, \(\vec{p} = m\vec{v}\).

Impulse of a force is the product of force and the time for which it acts and is equal to the change in momentum, \(I = F\Delta t = \Delta p\).

In an isolated system with no external force, the total linear momentum of the system remains constant during any interaction.

For constant mass, Newton's Second Law reduces to \(\vec{F}_{net} = m\vec{a}\).

An inertial frame is a reference frame in which Newton's First Law holds, i.e., a frame that is either at rest or moving with uniform velocity.

A non-inertial frame is a reference frame that is accelerating with respect to an inertial frame, in which fictitious or pseudo forces must be introduced to apply Newton's laws.

Pseudo force is an apparent force introduced in a non-inertial frame of reference, given by \(\vec{F}_{pseudo} = -m\vec{a}_{frame}\), acting opposite to the acceleration of the frame.

Normal reaction is the contact force exerted by a surface on a body, acting perpendicular to the surface.

Friction is the contact force that opposes the relative motion or the tendency of relative motion between two surfaces in contact.

Static friction acts between surfaces at rest relative to each other and can vary up to a limiting value, while kinetic friction acts when surfaces slide over each other with relative motion.

Limiting friction is the maximum value of static friction just before the body begins to move relative to the surface.

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