11. Work and Energy-Potential Energy Science Class 9 In English-CBSE Notes
Explore science cbse notes for Class 9 Chapter 11. Work and Energy Topic Potential Energy in English medium for exams preparation.
11. Work and Energy-Potential Energy Science Class 9 In English-CBSE Notes
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All Topics Chapter 11. Work and Energy
- 1. Introduction of work
- 2. Work formula by Scientifically and Mathematically
- 3. Magnitude of Work
- 4. Energy and its forms
- 5. Potential Energy
- 6. Kinetic Energy
- 7. Commercial Unit of Energy
Notes
11. Work and Energy-Potential Energy Science Class 9 In English-CBSE Notes
11. Work and Energy
Potential Energy
Potential Energy: The energy stored in an object by changing its position is called potential energy.
It is a type of mechanical energy.
Examples of potential energy:
(I) Stored water in dam
(II) Wound up spring of a toy car
(III) Stretched the string of a bow with arrow
(IV) Stretched a rubber band
(V) Lifted up a hammer
(VI) Lifeted up any object at height
Factors which affecting the potential energy:
(i) Mass : Increasing of mass of an object causes greater potential energy.
(ii) Height from ground: Increasing the height of an object gives greater potential energy.
(iii) Change in shape: Streching, bending or twisting an object gives greater potential energy.
The Gravitational Potential Energy:
An object increases its energy when raised through a height. This is because work is done on it against gravity while it is being raised. The energy present in such an object is the gravitational potential energy.
(i) When an object is lifted up or raised up it works against the gravity. As it raised up at height it gains the potential energy.
(ii) The work done by gravity depends on the difference in vertical heights of the initial and final positions of the object and not on the path along which the object is moved.
(iii) The object gains energy equal to the work done on it.
POTENTIAL ENERGY OF AN OBJECT AT A HEIGHT
Consider an object of mass, m. Let it be raised through a height, h from the ground.
displacement = h
mass of the object = m
The minimum force required to raise the object is equal to the weight of the object = mg ( f = ma or mg) g is the acceleration due to gravity.
work done, W = force × displacement
= mg × h
= mgh
Since work done on the object is equal to mgh, an energy equal to mgh units is gained by the object. This is the potential energy (EP) of the object.
∴ EP = mgh
Example1: Find the energy possessed by an object of mass 10 kg when it is at
a height of 6 m above the ground. Given, g = 9.8 m s–2.
Solution:
Mass of the object, m = 10 kg,
displacement (height), h = 6 m, and
acceleration due to gravity, g = 9.8 m s–2.
Potential energy = mgh
= 10 kg × 9.8 m s–2 × 6 m
= 588 J.
The potential energy is 588 J.
All Topics Chapter 11. Work and Energy
11. Work and Energy-Potential Energy Science Class 9 In English-CBSE Notes
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CBSE Notes for Class 9 science Chapter 11. Work and Energy – Potential Energy
The CBSE Notes for Class 9 science Chapter 11. Work and Energy – Potential Energy are prepared to help students understand every concept in a simple, clear, and well-organized manner. These notes are based on the latest CBSE syllabus and are suitable for regular classroom learning, homework, revision, and examination preparation. Every topic is explained using easy language so that students can learn important concepts without difficulty and develop a strong academic foundation.
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