default_background
✕

Find the best tutors and institutes for Class 11 Tuition

Find Best Class 11 Tuition

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Q6.7(d):
State if each of the following statements is true or false. Give reasons for your answer. (d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

Solution :

1. Definitions and Theoretical Foundation

An inelastic collision is defined as a collision where the total kinetic energy ($K$) of the system is not conserved. While the linear momentum of the system remains conserved (provided no external forces act on the system), the kinetic energy transforms into other forms of energy such as heat, sound, or permanent deformation [Per the Law of Conservation of Energy].

2. Mathematical Analysis of Collision Energy

Consider a system of two masses $m_1$ and $m_2$ with initial velocities $u_1$ and $u_2$. The initial kinetic energy ($K_i$) is:

$K_i = \frac{1}{2} m_1 u_1^2 + \frac{1}{2} m_2 u_2^2$

After the collision, let the final velocities be $v_1$ and $v_2$. The final kinetic energy ($K_f$) is:

$K_f = \frac{1}{2} m_1 v_1^2 + \frac{1}{2} m_2 v_2^2$

In an inelastic collision, the energy balance equation is given by:

$K_i = K_f + \Delta Q$

where $\Delta Q$ represents the energy dissipated. By definition, for an inelastic collision, $\Delta Q > 0$. Therefore, $K_f < K_i$ holds true for typical inelastic collisions where energy is lost from the system's mechanical kinetic state.

3. Critical Examination of the Statement

The statement specifies "in an inelastic collision, the final kinetic energy is always less than the initial kinetic energy." To evaluate this, we must consider the nature of $\Delta Q$.

  • Scenario A: Standard Inelastic Collision: Kinetic energy is converted into internal energy (heat/deformation). Thus, $K_f < K_i$.
  • Scenario B: Explosive/Active Collision: If internal potential energy is released during the collision (e.g., a compressed spring between two blocks being released or a chemical explosion occurring during the impact), then $\Delta Q$ can be negative.
  • In such a case, the system gains kinetic energy from internal sources, leading to $K_f > K_i$.

4. Graphical Representation of Energy Transformation

K_i K_f Loss: ΔQ

5. Conclusion and Justification

The statement is False. While it is true that in most natural collisions kinetic energy is lost to heat or deformation (making $K_f < K_i$), an inelastic collision is technically defined simply as a collision where kinetic energy is not conserved ($K_f \neq K_i$). It does not mandate that the energy must be lost; it can also be gained if the system has internal potential energy that is converted into kinetic energy during the interaction.

Final Solution: The statement is False. An inelastic collision only requires that kinetic energy is not conserved; it does not explicitly require that $K_f < K_i$, as kinetic energy can increase if internal energy is released during the collision process.


More Questions from Class 11 Physics Work EXERCISES


CBSE Solutions for Class 11 Physics Work


Chapters in CBSE - Class 11 Physics


Top Tutors who teach Work

Manveer Singh khangarot Class 11 Tuition trainer in Gandhidham
(10)
Top Tutor
locationImg Sapna Nagar, Gandhidham
experience 3 yrs of Exp students 1 student
greenClock 13 hrs of classes completed
rsIcon 450 per hour
3+ Years of One-on-One Teaching | School & B.Tech CSE | Practical Learning & Concept Clarity
Online Classes Online Classes

I have 3 years of experience providing one-on-one tuition to students from Classes 10 to 12. For Class 11, I focus on building strong fundamentals and ensuring students understand concepts rather than relying on rote learning. I explain topics in a simple, student-friendly manner and use practical, real-life examples wherever possible. I help students with regular studies, homework, assignments, revision, exam preparation, and problem-solving. Being a final-year B.Tech CSE student, I can also help students develop logical thinking and a strong foundation in computer-related subjects. My teaching style is interactive, patient, and adapted to the individual student's pace and learning needs.

Indu Bhati

An excellent teacher who explains Chemistry concepts clearly and makes learning easy and interesting.

Skills: English , Mathematics and more

(12)
Top Tutor
locationImg Pungavadi Puthur, Tindivanam
experience 14 yrs of Exp students 3 students
greenClock 190 hrs of classes completed
rsIcon 333 per hour
Physics teacher with an Engineering background and 14 years of teaching experience
Online Classes Online Classes

I am a highly experienced educator with over 14 years of academic and teaching experience, including 12 years dedicated to undergraduate and postgraduate instruction in physics-based engineering subjects. I have also provided personalised private tuitions for school students, including ICSE 10th standard, with a focus on conceptual clarity and problem-solving. I am currently offering online and home tuition for Physics, especially tailored to high school students. If you're looking for a dedicated, concept-oriented, and motivational tutor who brings both academic depth and real-world applications into lessons, I’d be happy to assist.

Pradeep

I’ve been taking one-to-one online tuition for Class 11 CBSE Physics, and it’s been a really good experience. The teacher explains concepts in a very simple and clear way, which makes even tough chapters easy to understand. Classes are interactive, and I always feel comfortable asking questions—my doubts get cleared right away. The best part is how the teacher connects topics with real-life examples and gives useful tips for solving problems. I’ve started feeling much more confident in Physics now, and my interest in the subject has definitely grown. Totally recommend these classes to anyone who wants personal attention and better clarity in Physics!

Skills: Physics

(378)
Top Tutor
locationImg Madhurawada, Visakhapatnam
experience 20 yrs of Exp students 47 students
greenClock 5175 hrs of classes completed
rsIcon 400 per hour
Professional Trainer with 30 years of teaching experience in PHYSICS for IIT/NEET/CBSE/ICSE etc.
Online Classes Online Classes
homeTutions Student's Home
regularClasses Tutor's home

I mentored several students for CBSE/ICSE/STATE/NIOS 11 th class in physics for the last 24 years.

Sakshi Singh

I recently started taking online physics classes with him, and my experience has been really positive. He is a knowledgeable and dedicated teacher who explains even difficult concepts in a simple and understandable manner. What I appreciate most is his patience and willingness to clear every doubt, ensuring that I have a proper understanding of the topic before moving forward. His teaching approach makes physics much easier to follow and helps build confidence in the subject. He is also very approachable and creates a comfortable learning environment where asking questions never feels difficult. I would definitely recommend him to students looking for a supportive and effective physics tutor.

Skills: Physics
Also teaches: Class 12 Tuition, Class 9 Tuition and more

(165)
Top Tutor
locationImg Rajajinagar Mahaganapathi Nagar, Bangalore
experience 15 yrs of Exp students 52 students
greenClock 5141 hrs of classes completed
rsIcon 400 per hour
Professional GMAT, GRE & SAT Math trainer with 15 years of experience.
Online Classes Online Classes
regularClasses Tutor's home

I have done Post Graduation in Mathematics, Presidency college, Chennai University. I was a topper and a gold medalist in MSc Math Presidency College. I have been teaching math from last 15 years. I have taken tuitions for 11th Maths for students across different boards like CBSE, ICSE, IGCSE, ISC and State Board. I have an expertise in Math with an excellent track record. My focus is students' success. Conceptually , I make students strong so that they can handle any question in the exam. I give challenging problems in the class so that you can become competetive. Your future is very promising with me.

Srikar

Mala ma'am makes me understand concepts with clarity and clears all my doubts with lots of patience making to solve problems with ease. Thank you ma'am for always being there to help and support me.

Skills: Mathematics , Applied Mathematics
Also teaches: Class 9 Tuition, GRE Coaching and more

(11)
Top Tutor
locationImg Peera Garhi, Delhi
experience 8 yrs of Exp students 2 students
greenClock 72 hrs of classes completed
rsIcon 700 per hour
Experience &Certified Computer Science/IP instructor
Online Classes Online Classes
homeTutions Student's Home
regularClasses Tutor's home

I am having more than 8+ years of experience to teach the Computer Science/ informatic Practice subject to the students of 11th class. I can teach all boards students.

Skills: Computer Science

Other Subjects in CBSE - Class 11

Worksheet Icon

Download free CBSE - Class 11 Physics Work EXERCISES worksheets

Download Now

Find Best Class 11 Tuition ?

Find Now »