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Work and energy

Work and energy relates to CBSE - Class 9/Science/Unit 3-Motion, Force and Work

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Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Work and energy

Nazia Khanum

Understanding Potential Energy Potential energy is a fundamental concept in physics that refers to the energy possessed by an object due to its position or configuration relative to other objects. It's essentially the energy stored within a system that can be converted into other forms of energy.... read more

Understanding Potential Energy

Potential energy is a fundamental concept in physics that refers to the energy possessed by an object due to its position or configuration relative to other objects. It's essentially the energy stored within a system that can be converted into other forms of energy. Understanding potential energy is crucial in various fields, including physics, engineering, and chemistry.

Types of Potential Energy

Potential energy manifests in different forms depending on the nature of the system and the forces involved. Here are some common types of potential energy:

  1. Gravitational Potential Energy

    • Gravitational potential energy arises from the position of an object in a gravitational field. The gravitational potential energy UU of an object of mass mm at a height hh above a reference point (usually the Earth's surface) is given by the formula: U=mghU=mgh, where gg is the acceleration due to gravity (approximately 9.8 m/s29.8m/s2 on Earth).
  2. Elastic Potential Energy

    • Elastic potential energy is associated with the deformation of an elastic object, such as a spring or rubber band. When such objects are stretched or compressed, they store potential energy that can be released when they return to their original shape. The elastic potential energy UU stored in a spring is given by: U=12kx2U=21kx2, where kk is the spring constant (a measure of the stiffness of the spring) and xx is the displacement from the equilibrium position.
  3. Chemical Potential Energy

    • Chemical potential energy is stored within the chemical bonds of molecules. It is released or absorbed during chemical reactions. For example, when fuel burns, the chemical potential energy stored in its molecular bonds is converted into thermal energy and other forms of energy.
  4. Electrostatic Potential Energy

    • Electrostatic potential energy arises from the interaction between charged particles. Oppositely charged particles attract each other and possess potential energy due to their relative positions. The electrostatic potential energy UU between two point charges q1q1 and q2q2 separated by a distance rr is given by: U=k∣q1q2∣rU=rkq1q2, where kk is Coulomb's constant.
  5. Nuclear Potential Energy

    • Nuclear potential energy is stored within the nucleus of an atom. It is released or absorbed during nuclear reactions, such as nuclear fusion and fission. The tremendous amount of energy released in nuclear reactions is due to the conversion of nuclear potential energy into other forms of energy.

Understanding the various forms of potential energy is essential for analyzing physical systems, predicting behaviors, and engineering applications across different domains.

 
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Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Work and energy

Nazia Khanum

Given Data: Work done (W) = 60 J Time taken (t) = 6 seconds Formula for Power: P=WtP=tW Calculations: P=60 J6 sP=6s60J Result: Power (P) = 10 watts (W) Explanation: Power is the rate at which work is done or energy is transferred per unit of time. In this case, the power exerted by... read more

Given Data:

  • Work done (W) = 60 J
  • Time taken (t) = 6 seconds

Formula for Power: P=WtP=tW

Calculations: P=60 J6 sP=6s60J

Result:

  • Power (P) = 10 watts (W)

Explanation:

  • Power is the rate at which work is done or energy is transferred per unit of time.
  • In this case, the power exerted by the man is 10 watts, which means he is exerting energy at a rate of 10 joules per second.
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Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Work and energy

Nazia Khanum

Understanding Work Done on an Object Introduction: In the realm of physics, the concept of work done on an object holds significant importance. Work is defined as the force applied to an object over a distance, causing it to move. However, there are instances where the work done on an object is zero.... read more

Understanding Work Done on an Object

Introduction: In the realm of physics, the concept of work done on an object holds significant importance. Work is defined as the force applied to an object over a distance, causing it to move. However, there are instances where the work done on an object is zero. Let's explore one such example.

Example: Work Done on a Stationary Object

Scenario: Consider a book resting on a table. You exert a force by pressing down on the book with your hand, but the book doesn't move.

Explanation: In this scenario, despite applying a force to the book, there is no displacement in the direction of the force. Therefore, the work done on the book is zero.

Factors Contributing to Zero Work:

  • No Displacement: The book remains stationary; hence, there is no displacement along the direction of the force.
  • Perpendicular Force: If the force you apply is perpendicular to the direction of potential motion, no work is done. In this case, the force of gravity pulling the book downward is balanced by the normal force exerted by the table upward, resulting in zero net force in the direction of motion.
  • Magnitude of Force: Even if you apply a significant force, if it doesn't result in any displacement in the direction of the force, the work done is zero.

Conclusion: Understanding the conditions under which work done on an object is zero is crucial in grasping the concept of work in physics. In scenarios where there is no displacement or the force is perpendicular to the direction of potential motion, the work done on the object is zero.

 
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