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2. Work, Energy and Power

Work, energy, and power are fundamental concepts in physics that interrelate with one another. Work is defined as the energy transfer that occurs when an object is displaced by an applied force, measured in joules. Power is the rate of work done over time, while the work-energy theorem connects the work done on an object to its change in kinetic energy. The principles of conservation of energy dictate that energy cannot be created or destroyed, only transformed, affecting all physical systems.

Sections

  • 2

    Work

    Work is the measure of energy transfer that occurs when an object is moved by an external force over a distance.

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  • 2.1

    Definition Of Work

    This section defines key concepts of work and energy, detailing their formulas, types, and units.

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  • 2.1.1

    Formula

    This section presents the fundamental formulas associated with work, energy, and power, encapsulating the relationships among key physical concepts.

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  • 2.1.2

    Units

    This section introduces the key concepts of work, energy, and power, along with their definitions, formulas, and units of measurement.

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  • 2.1.3

    Conditions For Work

    Work requires the application of force, displacement in the force's direction, and an appropriate angle between them.

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  • 2.1.4

    Types Of Work

    This section introduces the types of work, namely positive, negative, and zero work, based on the direction of force and displacement.

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  • 2.2

    Energy

    Energy is the capacity to do work and comes in various forms, including kinetic and potential energy.

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  • 2.2.1

    Definition

    This section introduces the concept of work, defining it, and exploring its formulas and conditions.

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  • 2.2.2

    Units

    This section covers essential concepts of work, energy, and power, along with their definitions, formulas, types, and units.

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  • 2.2.3

    Forms Of Energy

    This section discusses the different forms of energy, primarily focusing on kinetic and potential energy, along with their definitions and formulas.

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  • 2.2.4

    Kinetic Energy (Ke)

    Kinetic energy is the energy that an object possesses due to its motion, defined by its mass and velocity.

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  • 2.2.5

    Potential Energy (Pe)

    Potential energy is the energy possessed by a body due to its position or configuration, essential for understanding the work-energy principle.

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  • 2.3

    Mechanical Energy

    Mechanical energy is the total energy in a system, comprising kinetic and potential energy, and it remains conserved in the absence of external forces.

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  • 2.3.1

    Definition

    This section defines critical concepts such as work, energy, mechanical energy, and power, establishing their formulas and units.

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  • 2.3.2

    Formula

    This section outlines the formulas for work, energy, and power, explaining their significance and interconnections in physical systems.

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  • 2.3.3

    Conservation Of Mechanical Energy

    The conservation of mechanical energy states that in an isolated system, the total mechanical energy remains constant as energy transforms between potential and kinetic forms.

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  • 2.4

    Power

    Power represents the rate at which work is performed or energy is transferred.

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  • 2.4.1

    Definition

    This section defines key concepts such as work, energy, mechanical energy, power, and their relationships in physics.

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  • 2.4.2

    Formula

    This section introduces essential concepts related to work, energy, power, and their interrelationships through various formulas.

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  • 2.4.3

    Units

    This section explores the concepts of work, energy, power, and their relationships, detailing the formulas and units associated with each.

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  • 2.4.4

    Relation Between Power And Energy

    This section explains the relationship between power and energy, highlighting how power is the rate at which energy is transferred or work is done.

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  • 2.5

    Work-Energy Theorem

    The Work-Energy Theorem states that the work done on an object is equal to the change in its kinetic energy.

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  • 2.5.1

    Statement

    This section introduces fundamental concepts of work, energy, power, and their interrelations.

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  • 2.5.2

    Formula

    This section explores the formulas related to work, energy, and power, emphasizing their significance in physics.

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  • 2.6

    Law Of Conservation Of Energy

    The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed.

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  • 2.6.1

    Statement

    This section provides an overview of the fundamental concepts of work, energy, power, and their interrelationships.

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  • 2.6.2

    Implication

    The implication of energy states that energy can neither be created nor destroyed, only transformed, ensuring that the total energy in an isolated system remains constant.

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References

Copy of physisc 2.pdf

Class Notes

Memorization

What we have learnt

  • Work is done when a force c...
  • Energy is the capacity to d...
  • Power is the rate at which ...

Final Test

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