Class 11 Physics Work Enery and Power Topper’s Short Notes PDF Will be Provided Here, These Short Notes Can be the Best Resource to Revise a Complete Chapter Within a Few Minutes with all Important Formulas & Definitions. Each Year Around 2 questions from this Chapter come in Jee Mains And 1 Question in the Neet Exam.
You can Use Class 11 Physics Work, Energy, and Power Topper’s Short Notes for Quick Revision Before Exam Like Entrance Exams or Class test also you can print this pdf and revise regular basis like in a month or week. with this method, you can increase your score.
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Work, Energy and Power Short Notes
Work
In Physics, work refers to ‘mechanical work’. Work is said to be done by a force
on a body when the body is displaced through some distance in the
direction of the applied force.
However, when there is no displacement in the direction of the applied force, there
is no work done, i.e., work done is zero, when the displacement of the body in the
the direction of the force is zero.
Conservative & Non-Conservative Forces
a) Conservative force: A force is said to be conservative when the work done by or against the force in moving a body is dependent only on the initial and final positions of the body, and not on the nature of the path followed between the initial and the final positions. This suggests that the work done by or against a conservative force in moving a body over any path between fixed initial and final positions would be the same. For instance, gravitational force is a conservative force.
Properties of Conservative forces:
- Work done by or against a conservative force in moving a body from one position to the other depends only on the initial position and final position of the body.
- Work done by or against a conservative force does not depend upon the nature of the path followed by the body in going from initial position to the final position.
- Work done by or against a conservative force in moving a body through any round trip (i.e., closed path, where final position coincides with the initial position of the body) is always zero.
b) Non-conservative Forces: A force is said to be non-conservative when the work done by or against the force in moving a body from one position to another depends on the path between these two positions.
For instance, frictional forces are non-conservative forces.
Power
Power of a person or machine refers to the time rate at which work is done by it.
Kinetic Energy
The kinetic energy of a body refers to the energy possessed by the body by virtue of its motion.
Here are some examples:
- A bullet fired from a gun can pierce through a target on account of kinetic energy of the bullet.
- Windmills work on the kinetic energy of air. For instance, sailing ships use the kinetic energy of wind.
- Water mills work on the kinetic energy of water. For instance, fast-flowing streams are utilized to grind corn.
- A nail is driven into a wooden block on account of kinetic energy of the hammer striking the nail.
Work Energy Theorem/Principle
According to this principle, work done by net force in displacing a body is the same as the change in kinetic energy of the body.
Thus, when a force does some work on a body, the kinetic energy of the body increases by the same amount. Conversely, when an opposing (retarding) force is applied on a body, its kinetic energy decreases. The decrease in kinetic energy of the body is equal to the work done by the body against the retarding force. Thus, according to work energy principle, work and kinetic energy are equivalent quantities.
Work Energy and Power Short Notes PDF Download
Class 11 Physics Chapter Work Energy and Power Short Notes PDF Link is Given Below Go and Download it Must Remember to Use These Short Because it Contains lot of Hard work to Create.
