work enery power Ncert answers Related: Introduction to work and energy - Work, Energy and Power, Class 11, Physics

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work enery power Ncert answers Related:  Introduction to work and energy - Work, Energy and Power, Class 11, Physics

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Practice questions for final exam practice

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Introduction to Work and Energy

Work and energy are two important concepts in physics that are closely related to each other. They help us understand various physical phenomena and are used to solve problems related to motion and forces.

Work

Work is defined as the product of the force applied on an object and the displacement of the object in the direction of the force. It is a scalar quantity and is measured in joules (J). Mathematically, work (W) is given by the equation:

W = F * d * cosθ

where F is the force applied, d is the displacement, and θ is the angle between the force and displacement vectors.

Energy

Energy is the capacity to do work. It can exist in various forms such as kinetic energy, potential energy, thermal energy, etc. The SI unit of energy is also joules (J). Energy can be transferred from one object to another or can be converted from one form to another.

Power

Power is defined as the rate at which work is done or energy is transferred. It is a scalar quantity and is measured in watts (W). Mathematically, power (P) is given by the equation:

P = W / t

where W is the work done or energy transferred, and t is the time taken.

Relationship between Work, Energy, and Power

- Work and energy are closely related, as work done on an object results in a change in its energy.
- The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.
- Power is the rate at which work is done or energy is transferred. A high power means work is done or energy is transferred quickly, while a low power means it is done slowly.

Key Points:
- Work is the product of force and displacement, while energy is the capacity to do work.
- Power is the rate at which work is done or energy is transferred.
- Work and energy are closely related, and the work-energy theorem states that work done is equal to the change in kinetic energy.
- Power is the rate at which work is done, and a high power means work is done quickly.
- Both work and power are measured in joules, while power is measured in watts.

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