## Tuesday, October 23, 2007

### Study guide H C Verma JEE Physics Ch. 8 WORK AND ENERGY

Kinetic and potential energy;
Work and power; Conservation of linear momentum and mechanical energy.
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Sections covered

1. Kinetic enery
2. Work and work energy theorem
3. Calculation of work done
4. Work energy theorem for a system of particles
5. Potential energy
6. Conservative and nonconservative forces
7. Definition of Potential energy and conservation of mechanical energy
8. Change in the potential energy in a rigid body motion
9. Gravitational potential energy
10. Potential energy oif a compressed or extended spring
11. Different forms of energy: Mass energy equivalence
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Study Plan
Day 1
1. Kinetic energy
2. Work and work energy theorem
3. Calculation of work done
Day 2
Ex. 8.1 and 8.2
Worked Out Examples (WOE): 1,2,3

Day 3
4. Work energy theorem for a system of particles
5. Potential energy
6. Conservative and nonconservative forces

Day 4
Chapter 8
WOE 4,5,6
Exercises 1,2,3

Day 5
7. Definition of Potential energy and conservation of mechanical energy
Ex. 8.3
8. Change in the potential energy in a rigid body motion
9. Gravitational potential energy
Ex. 8.5

Day 6
Chapter 8
WOE: 6,7,8
Exercises 4,5,6

Day 7

8.10. Potential energy of a compressed or extended spring
Ex. 8.6, 8.7,
11. Different forms of energy: Mass energy equivalence
WOE: 7 to 10

Day 8
Chapter 8
WOE 11 to 14
Exercises: 7 to 10

Day 9
Chapter 8
Exercises: 11 to 20

Day 10
Chapter 8
Exercises: 21 to 30
Revision Period

Day 11
Chapter 8 Revision
Exercises: 31 to 35

Day 12
Chapter 8 Revision
Exercises: 36 to 40

Day 13
Chapter 8 Revision
Exercises: 41 to 45

Day 14
Chapter 8 Revision
Exercises: 46 to 50

Day 15
Chapter 8 Revision
Exercises: 51 to 55

Day 16
Chapter 8 Revision
Exercises: 56 to 60

Day 17
Chapter 8 Revision
Exercises: 61 to 64

Day 18
Chapter 8 Revision
Objective I

Day 19
Chapter 8 Revision
Objective II

Day 20
Chapter 8 Revision
Questions for Short Answer 1 to 17

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Concepts covered

In the chapter initially kinetic energy is discussed. The potential energy is explained in terms of change in kinetic energy. In a system of two particles kinetic energy is decreased as the system moves from configuration 1 to configuration 2.As it comes back to configuration 1, the kinetic energy once again increases. This is due to potential energy into which the decrease in kinetic energy changes. Then potential energy and various forms of potential energy are explained.

In this context, concepts of conservative and nonconservative forces are introduced.

If the work done by a force depends only on the initial and final states and not on the path taken, it is called a conservative force. Force of gravity, Coulomb force, and the force of spring are conservative forces.

The force of friction is nonconservative because the work done by the friction is not zero in a round trip.

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Audiovisual lectures

Work energy theorem
http://www.curriki.org/nroc/Introductory_Physics_1/lesson07/Container.html

Conservative Forces and Potential Energy
http://www.curriki.org/nroc/Introductory_Physics_1/lesson08/Container.html

Conservation of Energy
http://www.curriki.org/nroc/Introductory_Physics_1/lesson09/Container.html

Power
http://www.curriki.org/nroc/Introductory_Physics_1/lesson10/Container.html

websites
http://plasma4.sr.unh.edu/ng/phys407/phys407-6-29-05.pdf