# Nootan Solutions Work Power and Energy ISC Class-11 Physics Nageen Kumar Mittal

Nootan Solutions Work Power and Energy ISC Class-11 Physics  Vol-1 Nageen  Publication Kumar and Mittal Chapter-9 Numericals of latest edition. Step by step Solutions of Kumar and Mittal ISC Physics Class-11 Nageen Prakashan Numericals Questions. Visit official Website for detail information about ISC Board Class-11 Physics.

## Work, Power and Energy Nootan Solutions ISC Physics Class-11 Nageen Prakashan Chapter-9 Numericals of Kumar and Mittal.

 Class: 11 Subject: Physics Part-1 Chapter Ch:9  Work, Power and Energy
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of Page No. 383, 384, 385

### ISC Physics Class-11 Chapter-9  Work, Power and Energy

Work, power, and energy are among the most important concepts of mechanics. A moving car, walking up stairs, lifting heavy objects, an aeroplane flying, etc are among the most common examples that give us insight into the concept of work, power, and energy. There are few common notions of work, power, and energy that can be precisely defined in physics. These notions and measurements can be utilized to define and predict the motion and behavior of bodies.

#### What is Work?

Work is the measurement of energy transfer that takes place when an object is displaced by an external force applied in the direction of the displacement.

#### What is Power?

The rate of doing work is called power.

#### What is Energy?

The capacity for doing work is called Energy. It may exist in kinetic, potential, thermal, chemical, electrical, nuclear, or various other forms. The SI unit of energy is the same as that of work.

#### What is the Principle of Conservation of Energy?

The Principle related to the conservation of mechanical energy states that the total mechanical energy of a substance remains in equilibrium if the only forces acting upon the body are conservative in nature.

#### Law Of Conservation Of Energy

Energy can neither be created nor be destroyed however, it can be changed from one to another form. The total energy in an isolated system remains the same or energy is conserved over time. The mass remains the same in any closed system within boundaries except for the heat form which can cross boundaries.

As per the law, energy cannot be created and neither can be destructed but conveniently can be changed to different forms. Chemical energy can be converted into heat energy which could further be used to generate potential energy in a different body. As energy is changed from one to another form, net gain/loss remains the same. Therefore, energy is said to be conserved wherein the total amount remains the same.

### Chapter-9   Work, Power and Energy

ISC Physics Class-11 Nootan Solutions Nageen Prakashan Numericals of Kumar and Mittal

Page No.  383, 384, 385

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