The Work-Energy Theorem For A Variable Force
Chapter Name : Work, Energy And Power |
Sub Topic Code : 101_11_06_06_01 |
Topic Name : The Work-Energy Theorem For A Variable Force |
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Sub Topic Name : The Work-Energy Theorem For A Variable Force |
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Introduction
Energy is an indirectly observed quantity which comes in many forms, such as kinetic energy, potential energy, radiant energy, and many others; which are listed in this summary article.
Pre-Requisites:
Energy
Activity:
Generator.
Real Life Question:
What is the unit of work done?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Work | A force is said to do work when it acts on a body so that there is a displacement of the point of application, however small, in the direction of the force. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Electric generator | A device that converts mechanical energy to electrical energy. |
Real life uses :
To produce energy.
Places to visit :
Steam engine.
Practical examples around us
| Examples | Explainations |
|---|---|
| Generators | Generators provide nearly all of the power for electric power grids. |
What you learn in Theory:
The energy associated with the work done by the net force does not disappear after the net force is removed (or becomes zero), it is transformed into the Kinetic Energy of the body. We call this the Work-Energy Theorem.
What you learn in Practice:
If the object is not rigid and any of the forces acting on it deforms the object, then the Work-Energy Theorem will no longer be valid. Some of the energy transferred to the object has gone into deforming the object and is no longer available to increase or decrease the object's Kinetic Energy.