Question

Assertion: Total mechanical energy of the system can never be greater than potential energy. Reason: If non-conservative forces perform negative work, then mechanical energy of the system decreases. (A) $\mathrm{A}$ (B) $\underline{B}$ (C) $\mathrm{C}$ (D) D

Name: Problem 100, Chapter 4: A Complete Resource Book in Physics for JEE Main
Uploaded: 2022-01-09T15:10:00-08:00
Duration: 1 min 19 s
Channel: Prem Bijarniya
Description: Assertion: Total mechanical energy of the system can never be greater than potential energy. Reason: If non-conservative forces perform negative work, then mechanical energy of the system decreases. (A) A (B) B (C) C (D) D

   Assertion: Total mechanical energy of the system can never be greater than potential energy.
Reason: If non-conservative forces perform negative work, then mechanical energy of the system decreases.
(A) $\mathrm{A}$
(B) $\underline{B}$
(C) $\mathrm{C}$
(D) D

A Complete Resource Book in Physics for JEE Main

Sanjeev Kumar 1st Edition

Chapter 4, Problem 100

Instant Answer

Solved by Expert Prem Bijarniya

01/09/2022

Step 1

This is true. The total mechanical energy of a system is the sum of its kinetic energy and potential energy. Therefore, the total mechanical energy can be equal to the potential energy when the kinetic energy is zero, but it can never be greater than the potential Show more…

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Assertion: Total mechanical energy of the system can never be greater than potential energy. Reason: If non-conservative forces perform negative work, then mechanical energy of the system decreases. (A) $\mathrm{A}$ (B) $\underline{B}$ (C) $\mathrm{C}$ (D) D

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Key Concepts

Mechanical Energy

This is the sum of kinetic and potential energy within a system. It represents the total energy available for doing work under ideal conditions, but can change due to forces acting on the system, especially those that are non-conservative.

Potential Energy

This energy is stored in a system due to its position, configuration, or state. While it is an important component of mechanical energy, it does not place an upper bound on the total mechanical energy, since kinetic energy also contributes to the overall energy of the system.

Non-Conservative Forces

These are forces, such as friction or air resistance, that do work on a system in a way that dissipates mechanical energy, usually converting it into thermal energy or other non-recoverable forms. Their work can reduce the mechanical energy of the system over time.

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