Topics in this chapter
- Work
- Work done by a fixed force
- 1 Joule work
- Negative, Positive and Zero Work
- Energy
- Kinetic Energy
- Formula for Kinetic Energy
- Potential Energy
- Gravitational Potential Energy
- Mechanical Energy
- Transformation of Energy
- Law of Conservation of Energy
- Conservation of energy during free fall
- Power
- Commercial Unit of Power
Work and energy notes pdf
Introduction
In this article we will provide you best work and energy class 9 notes that are made by my own and fully handwritten and contain very easy language that will be helpful for you to be understand it carefully
In this article we will provide you the best work and energy class 9 notes that are made by my own and fully handwritten and contain very easy language that will be helpful for you to understand it carefully.
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■ Work?
The definition of work done may vary in real life and scientifically. For Example, we may consider studying, talking, singing as work but it is not so in the case of science.
Example of scientific work done are
- Moving a chair from one location to another
- Lifting a book from the shelf and placing it on the table.
- Pushing a pebble lying on the ground
Work is done only if
- A force is applied to an object.
- If the object is displaced from one point to another point.
- Unit of work = Newton metre Joule
■ 1 Joule Work
- Magnitude of force: Greater the force, greater is the amount of work & vice - versa.
- Displacement: Greater the displacement, greater is the amount of work & vice - versa.
■ Negative, Positive and Zero work?
■ Energy
- The sun is the biggest source of energy.
- The Most of energy sources are derived from sun.
- Some energy is received from nucleus of atoms and tides.
■ Kinetic Energy?
- Moving cricket ball
- Running water
- Moving car
- A rolling stone
● Formula of Kinetic Energy?
■ Potential Energy
- Water kept in dam: It can rotate a turbine to generate electricity due to its position above the ground.
- Bent string of bow: Potential energy due to change of its shape released in the form of Kinetic energy while shooting an arrow.
- At hydroelectric power house, the potential energy of water is transformed into Kinetic energy and then into electric energy.
- Plants use solar energy (sun) to make chemical energy in food by the process of photosynthesis.
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