
Assertion: The concept of pseudo force is valid for both the inertial as well as non-inertial frame of reference.
Reason: A frame accelerated with respect to an inertial frame is non- non-inertial frame.
(A) Both assertion and reason are correct and reason is the correct explanation of assertion.
(B) Both assertion and reason are correct and reason is not the correct explanation for assertion.
(C) Assertion is correct but reason is incorrect.
(D) Assertion is incorrect but reason is correct.
Answer
124.8k+ views
Hint Force always acts when there is an acceleration produced in the body and for non-accelerating body or body moving with constant velocity, we deal with such motion in an inertial frame of reference.
Complete Step By Step Solution
1. Motion of an object is always determined by a well-defined system of coordinates. Hence, motion is relative. This well-defined frame of reference is known as frame of reference. Also, Frame of reference can be defined as a coordinate system (Cartesian coordinate system) relative to which the position and motion of a body may be described. This frame of reference is categorized into two types:
2. Inertial frame of reference – In which Newton laws’ are obeyed and holds good.
We know, from Newton’s second law of motion that;
\[\overrightarrow F = m\overrightarrow a \]
Where, \[\overrightarrow F \] = force applied on particle/ object,
\[\overrightarrow a \]= acceleration of particle
m = mass of particle
In an inertial frame of reference, the external force acting on a particle is zero always.
\[
\Rightarrow \overrightarrow F = 0 \\
\Rightarrow m\overrightarrow a = 0 \\
\]
Now, \[m \ne 0\]
\[ \Rightarrow \overrightarrow a = 0\]
\[\therefore \]Inertial frames of references are also known as non- accelerating frames of references.
3. Non-inertial frame of reference- In which, Newton's law doesn't hold good. And non- inertial frames of references are called accelerated frames of references. Let’s take an example, a man sitting in a bus at rest, when brakes are applied, the body of man tends to move in forward direction, that means acceleration is produced or some movement is produced in body without applying any force on body while he was initially sitting in rest position. So, it was supposed that a pseudo force is producing acceleration in the body while there is no actual force working on the body.
Here, \[\overrightarrow a \] has some value.
Now, the assertion says that the concept of pseudo force is valid for both the inertial as well as non-inertial frame of reference. But there is no acceleration in a particle when it is in an inertial frame of reference and hence no force is acting on the particle/ object. But when the particle is considered to be non-Inertial frame of reference, \[\overrightarrow a \] has some value. And a pseudo force is acting on a body. Thus, the concept of pseudo force is valid only for non-inertial frames of reference.
Similarly, Reason says that a frame accelerated with respect to an inertial frame is non- non-inertial frame which is true. Since from the definition also we know that an accelerating frame of reference is a non-inertial frame of reference.
Thus we can conclude that, option (D) is correct, i.e. Assertion is incorrect but reason is correct.
Note whenever a frame of reference deals with acceleration, it is always a non-inertial frame of reference and for inertial frame of references, \[\overrightarrow a = 0\]and body either is at rest or is moving with a constant velocity and no pseudo force acts on the body.
Complete Step By Step Solution
1. Motion of an object is always determined by a well-defined system of coordinates. Hence, motion is relative. This well-defined frame of reference is known as frame of reference. Also, Frame of reference can be defined as a coordinate system (Cartesian coordinate system) relative to which the position and motion of a body may be described. This frame of reference is categorized into two types:
2. Inertial frame of reference – In which Newton laws’ are obeyed and holds good.
We know, from Newton’s second law of motion that;
\[\overrightarrow F = m\overrightarrow a \]
Where, \[\overrightarrow F \] = force applied on particle/ object,
\[\overrightarrow a \]= acceleration of particle
m = mass of particle
In an inertial frame of reference, the external force acting on a particle is zero always.
\[
\Rightarrow \overrightarrow F = 0 \\
\Rightarrow m\overrightarrow a = 0 \\
\]
Now, \[m \ne 0\]
\[ \Rightarrow \overrightarrow a = 0\]
\[\therefore \]Inertial frames of references are also known as non- accelerating frames of references.
3. Non-inertial frame of reference- In which, Newton's law doesn't hold good. And non- inertial frames of references are called accelerated frames of references. Let’s take an example, a man sitting in a bus at rest, when brakes are applied, the body of man tends to move in forward direction, that means acceleration is produced or some movement is produced in body without applying any force on body while he was initially sitting in rest position. So, it was supposed that a pseudo force is producing acceleration in the body while there is no actual force working on the body.
Here, \[\overrightarrow a \] has some value.
Now, the assertion says that the concept of pseudo force is valid for both the inertial as well as non-inertial frame of reference. But there is no acceleration in a particle when it is in an inertial frame of reference and hence no force is acting on the particle/ object. But when the particle is considered to be non-Inertial frame of reference, \[\overrightarrow a \] has some value. And a pseudo force is acting on a body. Thus, the concept of pseudo force is valid only for non-inertial frames of reference.
Similarly, Reason says that a frame accelerated with respect to an inertial frame is non- non-inertial frame which is true. Since from the definition also we know that an accelerating frame of reference is a non-inertial frame of reference.
Thus we can conclude that, option (D) is correct, i.e. Assertion is incorrect but reason is correct.
Note whenever a frame of reference deals with acceleration, it is always a non-inertial frame of reference and for inertial frame of references, \[\overrightarrow a = 0\]and body either is at rest or is moving with a constant velocity and no pseudo force acts on the body.
Recently Updated Pages
Difference Between Circuit Switching and Packet Switching

Difference Between Mass and Weight

JEE Main Participating Colleges 2024 - A Complete List of Top Colleges

JEE Main Maths Paper Pattern 2025 – Marking, Sections & Tips

Sign up for JEE Main 2025 Live Classes - Vedantu

JEE Main 2025 Helpline Numbers - Center Contact, Phone Number, Address

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility & More

Class 11 JEE Main Physics Mock Test 2025

JEE Main Exam Marking Scheme: Detailed Breakdown of Marks and Negative Marking

JEE Main 2023 January 24 Shift 2 Question Paper with Answer Keys & Solutions

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

JEE Main 2025: Conversion of Galvanometer Into Ammeter And Voltmeter in Physics

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 11 Physics Chapter 1 Units and Measurements

NCERT Solutions for Class 11 Physics Chapter 9 Mechanical Properties of Fluids

Units and Measurements Class 11 Notes: CBSE Physics Chapter 1

NCERT Solutions for Class 11 Physics Chapter 2 Motion In A Straight Line

NCERT Solutions for Class 11 Physics Chapter 7 Gravitation
