NCERT Solutions for class 11 Physics Chapter 6: Work, Energy, and Power

NCERT Solutions for Class 11 Physics Chapter 6 Work, Energy, and Power deals with the important concepts of the chapter. Work is referred to as the process of energy that is transferred to an object's motion by applying force. It is generally represented as the product of displacement and force. Power is the amount of energy that is transferred in a unit of time.

Unit 4 Chapter 6 Work, Energy, and Power along with Unit 5 and Unit 6 have a weightage of 17 marks in the Class 11 Physics Examination. The NCERT Solutions for Class 11 Physics Chapter 6 covers Conservative Force, Conservation Of Mechanical Energy, and Relation Between eV And Joule.

Download PDF: NCERT Solutions for Class 11 Physics Chapter 6 


NCERT Solutions for Class 11 Physics Chapter 6

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Class 11 Physics Chapter 6 – Concepts Covered

  • Work is said to be done when a force that is applied to the body displaces it through a certain distance in the direction of the applied force.
It is measured as the product of the force and the distance moved in the direction of the force applied, i.e., W = F.S
  • If an object undergoes a displacement ‘S’ along a straight line while it is acted on by a force F that makes an angle 0 with S. The work done would then be the product of the magnitude of displacement and the component of force in the direction of displacement.
\(W = FScos \theta = \overrightarrow {F}.\overrightarrow {S}\)
  • The energy possessed by a body is its capacity to do work. Energy is measured in the unit Joule.
Mechanical energy can be classified as Kinetic energy and Potential energy.
  • Kinetic Energy is the energy possessed by a body by virtue of its motion. For an object having mass m and velocity v, the kinetic energy is given by:

Kinetic Energy or KE = ½ mv 2

  • Potential Energy is the energy of a body by virtue of its position or condition.
Potential energy is of two types – gravitational and elastic potential energy.

CBSE CLASS XII Related Questions

  • 1.
    The electron drift speed is estimated to be only a few mm/s for currents in the range of a few amperes. How, then, is the current established almost the instant a circuit is closed ?


      • 2.
        Define the terms (I) resonant frequency, and (II) power factor of a series LCR circuit. For what value of the power factor will the power dissipated in the circuit be maximum?


          • 3.

            Two cells of emfs 12 V and 6 V are connected in parallel as shown in the figure. Their internal resistances are \(1\,\Omega\) and \(0.5\,\Omega\) respectively. Calculate the emf and internal resistance of the equivalent cell between points A and B.


              • 4.
                Draw a labelled diagram of a step-up transformer. Obtain the ratio of secondary voltage to primary voltage in terms of number of turns in the two coils.


                  • 5.
                    The assertion that V = IR is a statement of Ohm’s law is not true. Why ?


                      • 6.
                        An astronomical telescope consists of two converging lenses. One of them of large aperture and large focal length is called objective lens and the other one, of smaller focal length and smaller aperture is called the eyepiece. It is used to see distant objects which are not seen clearly with naked eyes. The image formed by the objective lens acts as an object for the eyepiece and the final image produced by the eyepiece is magnified.

                          CBSE CLASS XII Previous Year Papers

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